Nifty - Manage projects, work, and communications in one place.
Mergefly - A modern UI for GitHub pull requests
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
CodeTriage - Help out your favorite open source projects and become a better developer while doing it.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Contractbook - Helping businesses scale with future-proof contracts