Just to give my piece of mind :).
I am supporting not only my own company but also an insurance company. I (we) use SourceForge projects in several locations
pfSense I use for Wan Aggregation (2 instances)
Untangle for Spam, Anti virus, Intrusion, Spyware etc. (4 Instances, one is commercial licensed)
SquirrelMail (two instances)
phpGoogle
The "Microsoft" argument goes a long way. The argument I mostly use is that Commercial Software, you pay for support up front, if you need it or not. With most Sourceforge products, you can purchase support only when needed.
Over the years I have ran the companies Networks and Websites I have probable saved then thousands of $$$ .
So, I am now a "crack"-head, possibly yes, but I am proud of that.
~Gerry