Finmark - Financial planning software for startups
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
EnterpriseReady - A guide to building the SaaS features that enterprises love.
itch.io - An online game marketplace and community.
SaaS Pricing Page eBook - Learn from the best practices of over 270 top SaaS companies
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.