What are /r/CompanyTracker's favorite Products & Services?

From 3.5 billion Reddit comments

In response to the Project Management/Milestone issues, it occurred to me that a good initial ice-breaker for this would be what PM tool to use.

I personally think that they're useful, when used correctly.

It does occur to me that this is a licensing/OS issue, and I started looking up OpenOffice-esque alternatives.

It seems some people use:

• The Gannt Project
• OpenProj
• OpenWorkbench - but the sourceforge/site seems to have imploded