Project management software

In the most recent issue of Computers in Libraries, Li Chen and Xueying Chen wrote about using a free software called Trello for project management. (Li Chen & Xueying Chen, How to Manage Library Projects with Trello, Computers in Libr., May 2017, at 19.) Project management software can be incredibly helpful for technical services departments - we are so workflow-dependent and we often manage large projects with several moving parts and lots of detail to track. At Boston University, we use the University-licensed SharePoint program to manage our projects, but recognize that there are lots of great options out there. It looks like Trello has the advantage of more visual tools, but SharePoint integrates with other Microsoft products we are already using; each library needs to consider what is important to them when evaluating these programs. Moving to project management software has helped us with projects like getting an institutional repository off the ground and managing our subscription agent renewal reviews. Does anyone have project management software they love? What makes it so great? I'm curious to hear about it in the comments.