: One of the most popular choices, AVC Free supports converting dozens of formats (like MP4, MKV, and MOV) into AVI. It is known for its user-friendly interface, batch processing, and support for hardware acceleration to speed up conversions.
: A legendary open-source tool, HandBrake is a powerful transcoder that can handle virtually any video input. While it has a slightly higher learning curve, it offers advanced customization for those who want to fine-tune their AVI output.
Several powerful software options are available for free download on Windows and Mac.