- threads (including run- and arrest-reasons)
- Sockets (including chunked transfer encoding on some implementations)
- Parts of the EXCL package
- Parts of ACL's SYS package
- ACL's NET.URI (networking) stuff
As of now ACL-COMPAT supports the following Lisp systems, in varying degrees of testedness:
The latest version of ACL-COMPAT is included within the Portableaserve code tree from Git at the Portableaserve SF Project site.