Converter from Markdown to the Gemini text format. It works as a Python module, or a command line application. One of its key features is that it can convert inline links into footnotes. It also supports tables, and will convert them into Unicode (or ASCII) tables. Anything else that it doesn't understand will remain the same as when you wrote it, like strikethrough for example.
I'm considering trying my hand at writing Pelican plugins with this module, so I can set up a Gemini site with my existing blog.
Bombadillo is a non-web browser, designed for a growing list of protocols operating outside of the web. This includes Gopher, Gemini, Finger, and your local file system. Other protocols are available as add-ons. Think Lynx, but for everything else.