This question is underspecified. Many packages exist for each category that you list, all designed to support collaboration across people distributed globally over different time zones.
So I can make a recommendation, based on open-source tools that have worked for me in the past. You may have specific needs that require more specific solutions, but you didn't mention them. Also, for productivity, it is useful if people can continue to use tools they are familiar with, and you didn't explain what tools your people already know.
In any case, here is my recommendation:
- use Subversion for source control
- use Roundup as the bug tracker
- use make for the build management, use Buildbot for automated, distributed builds
- use mailing lists, based on Mailman
