I would have the front page tell a story. Something like. OpenSSL Heartbleed bug affected millions of users because millions of software developers use this free software. The team behind it only received $2,000 a year in donations prior to the bug being found. There are 10,000s of software projects that you use every day building your tech stack. You should be investing in the development of those tools by helping to sponsor those projects and "tipping" the developers directly for their work.

I might then put a table that lists server projects, language based projects, database projects - that dives people into the next layer. For instance Lua -> Lua page with some of the big Lua projects listed.

Tell a story. You don't have to pay "enterprise licenses" for free software, but the tools you use need constant development. Anything you give helps those tools get better.