When looking at software, it's hard to tell the difference between what's good or bad on first glance, and unfortunately, bad software is a lot like a bad haircut--it takes a long time to fix what only took only minutes to wreck.
Enter the Social Source Commons, which serves as a platform for social activists and advocates to list the software that they use to get their jobs done. Need software to help with IM? Social Source Commons lists 33 tools and lets you see who had added each of those tools to their "toolbox." You can also search by person to see what a specific person uses. For example, Beth Kanter (Beth's Blog) or Holly Ross (NTEN).
Don't find what you were looking forward on Social Source Commons? You can also check out Ohloh, which lists open source software that people are using and contributing to; Free Software Directory, which is a project of the Free Software Foundation and United Nations Education, Scientific and Cultural Organization that lists free software that runs under free operating systems; and Go2Web20.net, which lists Web 2.0 applications and services. - K