MeWiG is a Windows Frontend to the MEncoder (part of MPlayer) using the .NET Framework.
You should be able to crop, scale, deinterlace, etc and finally convert almost any digital video-source, without the need for commandline-options.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.