Ramaze - Ramaze is a very simple and straight-forward web-framework.
Badger - A fast key-value store written natively in Go
Cuba - Cuba is a Ruby microframework for web development.
Grailed - Buy and sell used menswear
Scorched - Scorched is a generic, unopinionated, DRY, light-weight web framework for Ruby.
WakesApp - The simplest way ever to send reminders to friends