Adobe - Dreamweaver: Available as a single app or part of Creative Cloud. Pay per month

Adobe GoLive: Official product page, with description, details of features, and free trial download

Majordomo: The "Home" site for the latest version of the software at GreatCircle Associate

qmail: Official home of the replacement for sendmail. Much content in several languages, including news, links, user documentation and software, tips, and advice

The Mac Orchard: Links and Internet applications for Macintosh users

The Webalizer: Produces highly detailed, easily configurable, incremental HTML usage reports in many languages, from multiple log formats, with builds for Linux, Solaris, Mac, OS/2, Cobalt, OpenVMS, Netware, and BeOS. [Open Source, GPL

Unix Serial Port Resources: Mostly Sun related articles on serial port and console related issues

Xenu's Link Sleuth: Free windows spidering software that checks web sites for broken links