SourceForge is a great site to explore popular and new open source projects available. It is a website not only for IT Professionals but also sales and other fields professionals download softwares, explore alternatives and review products at the same time. It is completely trustworthy, ad free and the projects made available directly by the devs themselves. It also boasts a file versioning system to keep older versions. The support team is rather quick and the turnaround time is usually a few business hours. All in all a great resource on the internet.