The Amiga programs available there have been compressed with the lzx utility. To decompress them, open a Cli/Shell, and type unlzx x <name> <dir>, where <name> is the name of the downloaded program, and <dir> is the target directory, i.e. the place where a new drawer containing the program will be created; it must finish with ":" or "/".
Lzx is available here and has been compressed with the lha utility. Lha usage is similar to lzx and may be used to decompress lzx.
Lha is available here in self-extracting form: just execute Lha_e138.run, respond with y to all questions and it will install itself.
A500, 68000, OS 1.3, 2.5MB ram (1MB chip), OCS
A2000, 68060, OS 3.1, 32MB ram (512k chip), OCS
A1200, 68030, OS 3.1, 10MB ram (2MB chip), AGA
A4000, 68040, OS 3.0, 64MB ram (2MB chip), AGA + PicassoIV
Tested successfully with Enforcer (Cyberguard), Mungwall and IOTorture.