Bitweaver ( and many projects like it ) give you one thing that commercial projects can't, don't and never will: participation. I joined the bitweaver dev-team a few months back and found out how open the team really is.

No where else have I had the opportunity to be involved in the inner-most workings of a project. In IRC I am able to both ask questions and give my input on where particular bitweaver issues are headed and have it count based on it's merit, not because I have a resume a mile long or have donated a lot of money ( or time ) to the project; believe me I have none of the above. I am just walterwoj, team member and occasional bug fixer. In the grand scheme of things I may be one of the smallest contributers to the project but I have never felt that way or been treated that way by the larger contributers.

That, is where bitweaver really shines.