SASG International - - The official website of the Standardized Amiga Shareware Group, an alliance of well-known shareware authors offering products like MUI, and MagicWB.
SnoopDos - - Find out what those programs are doing. Great utility to help troubleshoot computer software related problems.
Stefan Ruppert - - Developer of several programs, handlers and datatypes.
System Security for AmigaOS - - Multiuser is the continuation of the Multiuser Filesystem (muFS), and provides UNIX style security for AmigaOS preventing people from accessing private/secret/sensitive files or deleting files they shouldn't.