We're Constructor customer, and use it to manage our open source projects. It's fast and simple, and does all we want.

In addition to all that, the founding team, esp. Seth, is a hidden feature! Every time I feel our team needs some extra functions, I book a time and talk to Seth. He asks very deep questions about our work flow and pain points. Some of the questions even helped me to reflect on our way of doing things, so we could use the opportunity to evolve.

(edit: fixed typos)