| &-Prolog | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ Spain | |
| A# | 1990 | ⊕ Algebraic | ⊕ Japan | Algebraic programming language | |
| A+ | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Array | ⊕ United States | Dialect of APL used at Morgan-Stanley |
| ABSTUR | 1990 | ⊕ Canada | |||
| AC | 1990 | ⊕ United States | Array C for CM | ||
| ACCENT | 1990 | ||||
| ACL | 1990 | ⊕ Motion-oriented | ⊕ Japan | ||
| ACORN | 1990 | ||||
| Acrith-XSC | 1990 | ⊕ United States | |||
| Action Languages | 1990 | ⊕ United States | |||
| Ada' | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ United States | Verifiable subset of Ada | |
| ADA/TL | 1990 | ⊕ United States | |||
| ADETRAN | 1990 | ⊕ Japan | |||
| ADS | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ 2d shape | ⊕ United States | Macro language for AutoCAD |
| AL | 1990 | ⊕ United States | Systolic array language | ||
| Alcool-90 | 1990 | ⊕ France | OO metalanguage | ||
| ALF | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ Germany | ||
| ALGERNON | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| ALLOY | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ United States | Multiparadigm massively parallel language | |
| ANDF | 1990 | ⊕ United States | |||
| ANDOR | 1990 | ⊕ Horn clause | ⊕ Japan | AND-OR Prolog | |
| ANDOR-II | 1990 | ⊕ Horn clause | ⊕ Japan | AND-OR Prolog | |
| ANS MUMPS 1990 | 1990 | ⊕ United States | |||
| AOPL | 1990 | ⊕ Japan | |||
| AppleScript | 1990 | ⊕ United States | |||
| ART-IM | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | ART with CLIPS features |
| AVA | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Adas | ⊕ United States | Verifiable Ada |
| Avalon/Common LISP | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United States | |
| Avenue | 1990 | ⊕ United States | |||
| BABEL | 1990 | ⊕ Portugal | |||
| bash | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Command systems | ⊕ United States | Command language for UNIX |
| BCL | 1990 | ||||
| behavior | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Robotics | ⊕ United States | Robotics control language |
| BMF | 1990 | ⊕ United Kingdom | |||
| Brown | 1990 | ⊕ United States | |||
| CAT | 1990 | ⊕ United States | |||
| CELIP | 1990 | ||||
| CESP | 1990 | ⊕ Japan | |||
| C-Flavors | 1990 | ⊕ United States | Scheme dialect with OO extensions and coroutines | ||
| Charity | 1990 | ||||
| CHARM | 1990 | ⊕ United Kingdom | |||
| CHIP-48 | 1990 | ||||
| CLASS | 1990 | ⊕ United States | |||
| CLIPS/R2 | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Rete/2 CLIPS |
| CLIST | 1990 | ⊕ United States | |||
| CLM | 1990 | ⊕ United States | Musical composition language | ||
| CML | 1990 | ⊕ United States | Concurrent ML | ||
| CMN | 1990 | ⊕ United States | Musical composition language | ||
| Cmusic | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Sound-Synthesis | ⊕ United States | Musical composition language |
| COB | 1990 | ⊕ Japan | C Objects | ||
| condela | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Germany | Neural Network Definition Language. | |
| CONPL | 1990 | ⊕ China | |||
| COOL | 1990 | ||||
| COOL | 1990 | ⊕ United States | |||
| CSP | 1990 | ⊕ United States | |||
| Dacta Logo | 1990 | ⊕ Denmark | |||
| DAda | 1990 | ⊕ United States | |||
| DATALOG | 1990 | ⊕ Italy | |||
| DIAL | 1990 | ||||
| DIAL/M | 1990 | ⊕ Japan | |||
| DinnerBell | 1990 | ||||
| DINO | 1990 | ⊕ United States | parallel programming language | ||
| DMAWK | 1990 | ⊕ United States | Database language based on AWK | ||
| DPRL | 1990 | ||||
| DSP/C | 1990 | ||||
| DSPL | 1990 | ||||
| Ease | 1990 | ⊕ United States | Semitically validated Linda Occam hybrid | ||
| EDUCE* | 1990 | ⊕ France | |||
| Ellie | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ Prototyping | ⊕ Denmark | Distributed OO language |
| ELLIS | 1990 | ||||
| Enhanced Show-and-Tell | 1990 | ⊕ United States | |||
| es | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ United States | Expert System | |
| FACOM-R | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Japan | PL/R on a FACOM minicomputer | |
| Falafel | 1990 | ⊕ Canada | |||
| FLEX | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Canada | Faster LEX | |
| FORMS/3 | 1990 | ⊕ United States | |||
| Fortnet | 1990 | ||||
| Fortran 90 | 1990 | ↓ ↑ ⊕ Numerical Scientific | ⊕ FORTRAN 90 standard | ⊕ International | |
| Fortran Extended | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ International | Interim name for Fortran 90 | |
| FoxPRO | 1990 | ⊕ United States | |||
| FP | 1990 | Vector port of FP | |||
| Framework | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | CMU Frame language | |
| Frontline Orwell | 1990 | ⊕ Australia | |||
| FX-90 | 1990 | ⊕ United States | Scheme dialect allowing side-effects | ||
| g3 | 1990 | ⊕ United States | |||
| Gabriel | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Graphical DSP simulation language | |
| Gambit | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ United States | Scheme variant | |
| Gamma | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ France | Massively parallel language derived from chemical reactions | |
| Garnet | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Interface and windowing | ⊕ United States | High level OO language with interface capabilities |
| Genie | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ 2d shape | ⊕ United States | Mentor's electronics CAD language |
| GENTRAN 90 | 1990 | ⊕ United States | Reduce-to-FOTRAN 90 translator | ||
| Ghostscript | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ 2d shape | ⊕ United States | Interpreter for postscript |
| Glisp | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United States | Alternate syntaxes for Common Lisp |
| Glue | 1990 | ⊕ United States | |||
| GOOD | 1990 | ||||
| GPSS FORTRAN III | 1990 | ↓ ↑ ⊕ Numerical Scientific | ⊕ United States | ||
| GVL | 1990 | ||||
| Haskell | 1990 | ⊕ International | |||
| Hermes | 1990 | ⊕ United States | |||
| HIB0L 2 | 1990 | ⊕ United States | |||
| HOL-90 | 1990 | ⊕ United Kingdom | |||
| Hope++ | 1990 | ⊕ United Kingdom | |||
| HPCODE | 1990 | ⊕ United States | |||
| Huron | 1990 | ↓ ↑ ⊕ Business Data Processing | ⊕ Labelled Matrix | ⊕ Canada | 4GL |
| Iconicode | 1990 | ⊕ United States | |||
| iCRL | 1990 | ||||
| Id | 1990 | ⊕ United States | |||
| Inform 2 | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Robotics | ⊕ United States | Motoman robotics language |
| IP Pascal | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ Pascals | ⊕ United States | Pascal with modern language features |
| ISETL | 1990 | ⊕ United States | |||
| J | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Array | ⊕ United States | Iverson's second (simplified, ascii, functional) array-based language |
| Janus | 1990 | ⊕ United States | |||
| JOYCE+ | 1990 | ⊕ United States | |||
| Kaleidoscope'90 | 1990 | ⊕ United States | |||
| Kali | 1990 | ⊕ United States | |||
| KAP | 1990 | ⊕ Sweden | |||
| KAPPA | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | Frame language |
| KB | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| KEE CLOS | 1990 | ⊕ United States | |||
| K-REP | 1990 | ⊕ United States | |||
| L.0 | 1990 | ⊕ United States | |||
| LCL | 1990 | ⊕ Germany | |||
| Leda | 1990 | ⊕ United States | |||
| LEGEND | 1990 | ⊕ United States | |||
| LEGO/Logo | 1990 | ⊕ Denmark | |||
| LIDEX | 1990 | ⊕ Brazil | System development environment with teaching features | ||
| LindaLISP | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United Kingdom | |
| LISP O2 | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ France | |
| LM3 | 1990 | ⊕ United States | Larch Modula-3 interface | ||
| LML | 1990 | ||||
| LML | 1990 | ⊕ Sweden | |||
| LNIKERS | 1990 | ||||
| LO | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United Kingdom | Linear Objects | |
| Logres | 1990 | ⊕ France | |||
| LogScheme | 1990 | ||||
| LORAM | 1990 | ⊕ United States | |||
| LPI-Basic | 1990 | ⊕ United States | |||
| LPI-C | 1990 | ||||
| LPI-C++ | 1990 | ||||
| LPI-COBOL | 1990 | ↓ ↑ ⊕ Business Data Processing | ⊕ United States | Cross-platform optimised COBOL 85 | |
| LPI-FORTRAN | 1990 | ↓ ↑ ⊕ Numerical Scientific | |||
| LPI-Pascal | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ Pascals | ⊕ United States | |
| LPI-PL/I | 1990 | ||||
| Lucy | 1990 | ⊕ United States | |||
| M1 | 1990 | ||||
| MANIFOLD | 1990 | ||||
| MAS | 1990 | ||||
| MasPar Fortran | 1990 | ↓ ↑ ⊕ Numerical Scientific | ⊕ United States | SIMD Fortran for MasPar | |
| Mast | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Expression oriented | ⊕ United Kingdom | Continuous simulations language |
| Maude | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | ||
| MaxSPITBOL | 1990 | ⊕ United States | |||
| MeldC | 1990 | ⊕ United States | |||
| Melinda | 1990 | ⊕ United States | Melinda: Linda with Multiple Tuple Spaces | ||
| Meta-Crystal | 1990 | ⊕ United States | |||
| MetaQuotes Language | 1990 | ⊕ United States | Stock trading lagnuage | ||
| microCRL | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Netherlands | Algebraic specification | |
| micro-GPSS | 1990 | ⊕ Sweden | |||
| MicroWorlds | 1990 | ⊕ Canada | |||
| MIKE | 1990 | ||||
| MIR | 1990 | ⊕ Ukraine | Mathematical language for the Mir computers | ||
| Miro | 1990 | Visual languages | |||
| Mizar PC | 1990 | ⊕ Poland | |||
| ML-Linda | 1990 | ||||
| MODCAL | 1990 | ⊕ United States | Systems version of HP-PASCAL | ||
| Modula-2* | 1990 | ⊕ Germany | |||
| MOPS | 1990 | ⊕ United States | |||
| MPL | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ United States | Data-parallel version of C for MASPAR | |
| MultiLogo | 1990 | ⊕ United States | |||
| muPad | 1990 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Algebraic | ⊕ Germany | Algebraic manipulation system |
| Muse | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Horn clause | ⊕ International | Or-Parallel Prolog |
| NCL | 1990 | ⊕ United States | |||
| NCL | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ United States | Network prolog | |
| NERECO | 1990 | ||||
| NoPumpG | 1990 | Visual languages | |||
| Novis | 1990 | Visual languages | |||
| NTF | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ Germany | |
| Oberon-V | 1990 | ⊕ Switzerland | |||
| Object-CHILL | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Pascals | ⊕ International | Proposed object-oriented extension of CHILL |
| OBSERV | 1990 | ⊕ Israel | |||
| Occam 2.1 | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ United Kingdom | Improved Occam 2 | |
| OO-CHILL | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Pascals | ⊕ International | Proposed object-oriented extension to CHILL |
| ORCA C | 1990 | ⊕ United States | C with ORCA functionality | ||
| OSQL | 1990 | ⊕ United States | Object-oriented Structured Query Language | ||
| P/I | 1990 | ⊕ Japan | |||
| P4 | 1990 | ⊕ United States | |||
| Paralation LISP | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United States | |
| Parallel FORTRAN | 1990 | ↓ ↑ ⊕ Numerical Scientific | ⊕ International | ||
| Parallel SML | 1990 | ⊕ United Kingdom | |||
| Pascal-FC | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ Pascals | ⊕ United Kingdom | |
| Paslog | 1990 | ⊕ France | Hybrid of Pascal and Prolog | ||
| PCLIPS | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Parallel CLIPS |
| PCP | 1990 | ⊕ United States | Parallel C | ||
| PECOS | 1990 | ⊕ France | OO constraint-based language | ||
| Perl | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Patterns | ⊕ United States | Pattern-based string manipulation |
| PFL | 1990 | ⊕ United Kingdom | Persistent Functional Language | ||
| PL/8 | 1990 | ⊕ Japan | |||
| PL/R | 1990 | ⊕ Japan | |||
| PLisp | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United States | Pattern Lisp |
| PM2 | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ Pascals | ⊕ Australia | Parallel Modula-2 |
| POLROB | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Poland | POL for robotic arms | |
| POLYA | 1990 | ⊕ United States | |||
| POLYGOTH | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ France | ||
| POMS | 1990 | ⊕ United Kingdom | |||
| POOL-I | 1990 | ⊕ Netherlands | |||
| PPI | 1990 | ⊕ Russian Federation | |||
| Prism | 1990 | ||||
| PROGRES | 1990 | ↓ ↑ ⊕ Business Data Processing | ⊕ Germany | Graph based programming language | |
| ProIcon | 1990 | ||||
| Prolog-2 | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ United Kingdom | |
| Prolog-D-Linda | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Horn clause | ⊕ Australia | Linda style Prolog |
| ProLOOP | 1990 | ⊕ United States | |||
| ProSet | 1990 | ⊕ Germany | |||
| PROTO-E | 1990 | ⊕ Japan | |||
| QBD | 1990 | ||||
| RACK | 1990 | ||||
| RAND-ABEL | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Decision tables | ⊕ United States | Simulation language for warfare |
| rc | 1990 | ⊕ United States | Plan 9 shell | ||
| RDL/C | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ France | |
| Real-Time C++ | 1990 | ⊕ Japan | Real-time extension of C++. | ||
| Resampling Stats | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Columnar sheets | ⊕ United States | Resmaplong capability Omnitab |
| RHET | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| ROME | 1990 | ⊕ United States | |||
| ROSE | 1990 | ||||
| RPG/400 | 1990 | ||||
| SAL | 1990 | SemWare Application Language | |||
| SAL | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United Kingdom | SPARK Annotation Language | |
| Sample | 1990 | ⊕ Russian Federation | |||
| SANDRA | 1990 | ||||
| SBasic | 1990 | ||||
| SB-ONE | 1990 | ⊕ United States | |||
| Scheme-Linda | 1990 | ⊕ United Kingdom | |||
| School | 1990 | ⊕ Brazil | |||
| SCL | 1990 | ↓ ↑ ⊕ Business Data Processing | ⊕ Response languages | ⊕ United States | Application development tool for SAS |
| SEL | 1990 | ⊕ France | |||
| Seneca | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ Switzerland | ||
| SETL/E | 1990 | ⊕ Germany | |||
| SETL2 | 1990 | ⊕ United States | |||
| Shared Prolog | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ Italy | |
| SIL | 1990 | ↓ ↑ ⊕ Specialised Languages | Simulation Language | ||
| SIMAN IV | 1990 | ⊕ United States | |||
| SIMFACTORY | 1990 | ⊕ United States | |||
| SIMFACTORY II.5 | 1990 | ⊕ United States | |||
| SIMPC | 1990 | ⊕ Germany | |||
| SIMPL | 1990 | ⊕ United States | Graphical control language | ||
| SISAL 90 | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ United States | A SISAL extension with higher order functions, polymorphism | |
| Skill | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ 2d shape | ⊕ United States | Cadence |
| SLANG | 1990 | ⊕ United States | |||
| Smalltalk Express | 1990 | ⊕ United States | |||
| Solve | 1990 | ||||
| SP | 1990 | ⊕ United States | |||
| SPARK | 1990 | ↓ ↑ ⊕ Multi-purpose | ⊕ United Kingdom | Provable Ada | |
| Spec | 1990 | ⊕ United States | |||
| SPHINX | 1990 | ⊕ United States | |||
| SPLASH | 1990 | ⊕ United States | |||
| SRL | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Predicate | ⊕ United States | Logic programming language |
| STAPLE | 1990 | ||||
| Sticks&Stones II | 1990 | ⊕ United Kingdom | |||
| Super Syntax | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ 2d shape | ⊕ United States | CAD Hyperscripting language |
| SuperTalk | 1990 | ⊕ United States | |||
| Sure | 1990 | ⊕ United States | |||
| Symphony Two | 1990 | ⊕ United States | |||
| SYNAPSE | 1990 | ⊕ Germany | |||
| Tarmac | 1990 | ⊕ United States | |||
| TBAG | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ Animation | ⊕ United States | Interactive animation language as extension of C++ |
| TCA | 1990 | ||||
| Tcl | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Tool Command Language | |
| TDFL | 1990 | ||||
| TELOS | 1990 | ⊕ United Kingdom | |||
| Tempora | 1990 | ||||
| TeX 3 | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | Text formatting language | |
| TF | 1990 | ⊕ Germany | |||
| TFDL | 1990 | ||||
| THETA | 1990 | ||||
| TinyTIM | 1990 | Macro scripting language for MUD | |||
| TKSolver Plus | 1990 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Algebraic | ⊕ United States | |
| TRIO | 1990 | ⊕ Italy | |||
| TRPL | 1990 | ⊕ United States | |||
| UAN | 1990 | ||||
| Verdi | 1990 | ⊕ Canada | |||
| VIVA | 1990 | ↓ ↑ ⊕ Experimental and other | ⊕ United States | ||
| viz | 1990 | ||||
| VULCAN | 1990 | ⊕ United States | |||
| Winkel | 1990 | ⊕ Denmark | |||
| WORLDS | 1990 | ⊕ Japan | |||
| WSCRIPT | 1990 | ⊕ Canada | |||
| XLISP 2 | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United States | |
| XLISP-PLUS | 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Lazy Evaluation LISPs | ⊕ United States | |
| Z++ | 1990 | ⊕ United Kingdom | |||
| Z-BASIC | 1990 | ||||
| Zinc | 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ France | ||
| ZQL | 1990 | ⊕ United States | |||
| ZQL[C++] | 1990 | ⊕ United States |