jShrinker is written in Java and can de/compress 7zip*, zip, bzip2, tar, lzma, rar, and gzip formats. It aims to be cross-platform and to provide an easy-to-use interface. It will include these features: batch decompression. *Decompress only
Yet another tool to catalog files and media. Extract and store metadata about files and similar entities in a hierarchical structure (image thumbnails, content of RAR/ZIP/TAR files, mp3 tags), everything mixed in a nice and usable interface.