| ECL | 1970 | Multi-purpose | Grammar and Syntax-oriented | United States | Harvard Extensible Computer Language |
| ECL | 1966 | Command systems | Commmand language for UNIVAC | ||
| ECL-1 | 1969 | Experimental and other | Interface and windowing | United Kingdom | Environment Control Language |
| Eclectic CSP | 2000 | United States | |||
| ECLIPSE | 1995 | United Kingdom | |||
| Eclipse | 1989 | Specialised Languages | RETE and production | United States | Extended CLIPS |