MakeMKV is a one-click solution to convert video from DVD or Blu-ray discs into MKV, which is a free and patent-unencumbered format that can be played everywhere. MakeMKV is a format converter or "transcoder". The only thing it does is convert video clips from a (usually encrypted) disc into a set of MKV files, preserving most information but not changing it in any way. The MKV format can store multiple video and audio tracks with all meta-information and preserve chapters.
pyReScene is a tool that recreates original RARs by backing up the metadata. It is a port of ReScene .NET to Python. It provides a mechanism for backing up and restoring the metadata from "scene" released RAR files. RAR archive volumes are rebuilt using the stored metadata in the SRR file and the files extracted from the RAR archive. pyReScene consists of multiple related tools: pyReScene Auto to create a complete SRR with one simple command, pyReSample to recreate sample files, and pyReScene Usenet to create SRR files on the fly from Usenet postings. Lots of other small scripts for managing SRR and SRS files are available too.