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HandBrake is a open-source tool, built by volunteers, for converting video from nearly any format to a selection of modern, widely supported codecs.

Free All-in-One video and audio converter

VidCoder is an open-source DVD/Blu-ray ripping and video transcoding application for Windows. It uses HandBrake as its encoding engine.

A converter designed by video editors. The professional compression tool accessible to all.

A Windows only Qt-based frontend for a bunch of other tools which can convert most input formats to common audio & video formats and containers.

An ANSI/ASCII text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.

VidBatch - is batch video processing tool for Windows.