| DEC PDP-4 soft. |  DDT-4 No. 4-6 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | DDT-5-2 No. 5-19 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | Debug System No. 5-11 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | Decimal to Binary Conversion by Radix Deflation No. 5-7 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-8 soft. | Decimal to Binary Conversion by Radix Deflation No. 8-7 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | DECPUN No. 7-10 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | DECtape Copy Routine No. 7-20 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-9 soft. | DECtape Copy Routine No. 9-1 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | DECtape DUPLICATE No. 5-22 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-8 soft. | DECtape Programming System No. 8-64 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-1 soft. | DEXTER | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | Display N Letter Word No. 7-31 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | Double Precision Signed Decimal Input/Output Subroutine No. 5-39 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-1 soft. | DSL Sort Routines No. 77 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-6 soft. | DTADIR No. 6-6 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-6 soft. | DTALST No. 6-7 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | DUMP ND 180 + FDUMP ND 180 No. 7-19 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-8 soft. | Editor Modified for DECtape No. 8-66 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-4 soft. | Engineering Project Scheduling System No. 4-11 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | ENLOSS No. 7-24 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | ERC Boot No. 5-27 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | Expanded Adding Machine No. 5-5 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-1 soft. | EXPCH No. 79 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | Extended Memory + Interrupt Test No. 7-32 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | FAST Start | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-4 soft. | FISP No. 4-13 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | Fixed Point Trace No. 1 No. 5-56 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-8 soft. | Fixed Point Trace No.2 No. 8-57 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | Floating Point Routines No. 5-8 | 1964 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | FORPLOT No. 5-31 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | FORTRAN Patch for EAE Arithmetic No. 7-15 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-1 soft. | FORTRAN Ver.3 No. 82.3 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-1 soft. | FORTRAN No. 82 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | FPTSCOPE + FPTPEN + FPTPLOT No. 7-8 | 1965 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | FTYPE No. 5-38 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | GENPLOT No. 5-30 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-7 soft. | GRASP No. 7-30 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-8 soft. | High Speed Reader Option for PDP-8 FORTRAN Compiler No. 8-62 | 1967 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-5 soft. | ICS One Page DECtape Routines No. 5-40 | 1966 | DECUS Digital Equipment Computer Users' Society |
| DEC PDP-8 soft. | Improvement to Digital 8-9-F Square Root No. 8-61 | 1967 | DECUS Digital Equipment Computer Users' Society |
