| ASSEMBLER | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Symbolic assemblers | ⊕ United States | Modification of Rochester Assembler at IBM Poughkeepsie |
| RAWOOP | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Symbolic assemblers | ⊕ United States | Macroassembler for UNIVAC 1103 |
| REG-SYMBOLIC | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Symbolic assemblers | ⊕ United States | Los Alamos symbolic assembler |
| SOAP | ⊕ 1955 | ↓ ↑ ⊕ Multi-purpose | ⊕ Symbolic assemblers | ⊕ United States | Symbolic Optimal Assembly Program |