Adapter - Adapter is freeware (100% free software). Unlike other free apps, Adapter is lightweight and comes with a completely spam free installer that doesn't install toolbars or gunk up your computer. Adapter won't add obnoxious watermarks to your output.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Freemake Video Converter - Freemake Video Converter Converts 500+ Formats & Gadgets FREE! Convert to MP4, AVI, MKV, WMV, DVD, Xvid. FREE Download. **Voted Best of 2018** Comes with FREE…
dmMediaConverter - FFmpeg GUI
File Converter - Convert & compress everything in 2 clicks!
Gihosoft Total Video Converter - Total Video Converter - Convert Any Popular Video and Audio