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parchive2 provides PAR 2.0 libraries and tools for creating parity files and recovering data using them. The key advance of PAR 2.0 is that you do not need to break a large file into smaller files before making parity files. See the parchive project for
similar - a program for detecting duplicate images,
simv - an extensible image file mover, and
snntpbatch - a batch oriented newsgroups client.
They are mainly intended for Linux but should be quite portable.