Which project management software do you use?

As my software (hardware as well) project development is getting more and more complicated, I am not able to handle it by just my 2 hands. I may need to hire 3rd party developers. So a project management software is required.

• Could any one give me opinions and share your experience.
• Windows software are also welcome. I just cannot find a Windows section on this site.

 

Are they similar to open-source Subversion, CVS, GIT, etc.?

 

Subversion, CVS, GIT, are version control software, not project management.
https://en.wikipedia.org/wiki/Version_control
https://en.wikipedia.org/wiki/Project_management_software

 

These are very close to my expectation!