Different projects aim at providing TCP/IP sockets portably across Common Lisp implementations. The table below summarizes the state of several of these libraries.
| Implementation | trivial-sockets | ACL-COMPAT | s-sysdeps | usocket | kmrcl | IOLib |
|---|---|---|---|---|---|---|
| SBCL | yes | yes | yes | yes | yes | yes |
| CMUCL | yes | yes | yes | yes | yes | yes |
| ArmedBear | yes | no | no | yes | no | no |
| clisp | yes | yes | no | yes | yes | yes |
| Allegro | yes | not relevant | no | yes | yes | no |
| LispWorks | yes | yes | yes | yes | yes | no |
| OpenMCL | yes | yes | yes | yes | yes | no |
| ECL | no | no | no | yes | no | no |
| Scieneer | no | yes | no | yes | no | no |
| GCL | no | no | no | no (to come) | no | no |
| Corman | no | yes | no | no (to come) | no | no |
| Total # | 8 | 7(+1) | 4 | 9 | 6 | 3 |