Preservation and maintenance of old software and websites.
| Dream | R4RS interpreter in assembly language | 
|---|---|
| Galapagos | Windows port of SCM with turtle graphics | 
| GScheme | Scheme for GNUstep in Objective-C | 
| Ikarus | R6RS native-code compiler | 
| Kali | Scheme 48 with distributed computation | 
| Mini-Scheme | R3RS in C with many forks | 
| PC Scheme | R3RS for DOS operating systems | 
| Picrin | R7RS interpreter in C89 | 
| RScheme | R5RS with persistent objects | 
| STk | R4RS interpreter with CLOS and Tk GUI | 
| VxScheme | R4RS for the VxWorks RTOS | 
| FFIGEN | Grovel C header files using lcc | 
|---|---|
| Header2Scheme | Grovel C header files using SCM | 
| psyntax | Portable syntax-case with implicit phasing | 
| DreamOS | Hobby OS based on Dream Scheme | 
|---|---|
| Unroff | Troff document converter | 
| Xxl | Spreadsheet written in STk | 
| Schemers.org | Curated by Shriram Krishnamurthi | 
|---|---|
| CMU Scheme Repository | Part of the CMU Artificial Intelligence Repository | 
| Internet Scheme Repository | Hosted at Indiana University | 
gitea.scheme.org