I work on some open source projects on the side:

EleutheriaPay (archived):

Elutheria Pay is a customizable self-hosted FOSS donation page for FOSS developers

fridayapp:

Lightweight Sprint Reprospective Tool

MiddleWhere:

MiddleWhere is an open source endpoint Auth Header -> Query String Token proxy in Golang.

Pollo (archived):

Pollo is an open-source, self-hosted, real-time polling solution targeting post-secondary educational institutions.

And more in the works...