
iGetcha.org is a suggested opensource and free software directory for the technological sustainability of nonprofits. It's also a simple, non-techie shortlist to assist organizations with a SOHO.
Sourceforge.net is the resource for open source software :) We recommend this site if your nonprofit is tech savvy or if you have someone on your team that is tech savvy ;) Sourceforge.net is awesome for nonprofits because everything is free to use and modify. There is not many sites out there that addresses the tech needs of the open source community. Period.