What I liked best about Phabricator is the number of features that it offers and its solid integration with the other tools created by Facebook. The workflow of creating and assigning a ticket, writing code, and sending it for review was made smoother thanks to Phabricator.

- open source - full features for a dev team - customize-able

Phabricator offers unparallelled power and flexibility without having to be a wizard in the field. When it was first implemented in our company we were able to simply pick it up and run with it without any training at all. It simply worked. This was not only the case for the programmers, but even non-technical staff were more than able to jump in with minimal instruction. The intuitive interface for triaging tasks makes it very easy for management to organize priorities and even easier for technical staff. The automated email notifications when task related operations are performed makes it extremely easy for communicating progress and questions back to the task subscribers without any extra work. The wiki is also a gem in and of itself. Being fully integrated into the overall system allows effortless linking between tasks, projects, repositories, specific commits, branches, etcs... all from one place. This has allowed for writing efficient and flawless technical documentation.