Two years ago I created a CLI tool called pgcli (http://pgcli.com). A postgres client with auto-completion. It became ridiculously successful. I got a few requests to support mysql. So I launched a kickstarter to write mycli (http://mycli.net). This also became quite successful.

There is a thriving community of core devs and a ton of users. I'm happy with both creations and made a lot of online friends.

These projects also led me to create a standalone python library for doing fuzzy matching. I'm quite proud of this one since the resulting code ended up being ridiculously small but produced really good results. https://github.com/amjith/fuzzyfinder/