Diskus is a high-level hard drive diagnostic and limited repair tool. It checks the disk geometry by writing numbered IDs into the sectors of the hard drive. Later one can verify that these sector-IDs on the disk are still correct, thereby detecting data which was not correctly written. There is an option to "freshen" the data on your harddrive, which will read and rewrite the sectors. With modern drives this will re-map defective sectors.
md5chk is a tool for creating MD5 sums. It was designed so that its output would be easy to use with command line shells. It guarantees that the MD5 sum is always "clean" of characters that would be misinterpreted by the shell and that special characters in the file names are always properly escaped.
mod_gfx is a configurable Apache module that uses libgd to perform image operations on the fly. Some of the supported image operations are: resize, resample, watermark, and crop. A couple of its special features are origin selection via URI regex and round-robin over a list of hosts.
Minnow is a concurrent programming language with a Ruby-like syntax. It compiles to an executable and uses a companion library to allow fully-rebalanced microthreads. Minnow gains a lot of strength from its actor model, which uses message passing, as opposed to threads and locking, as its concurrency model. Taking a cue from Erlang, actor creation and message passing is extremely lightweight (often on the order of a few nanoseconds). The language has a built-in foreign function interface that allows developers to leverage existing C-based libraries in a simple SWIG-like manner. Minnow's object model is based on "melding" features together to form objects.
Usenet Downloader can be used to retrieve newsgroup articles from NNTP servers. There is a generic NNTP class that can retrieve listings of groups, listing of group articles, and the article headers and bodies. There are other classes that can retrieve listing of groups from several different sites and insert the listings into a MySQL database table. Other classes can retrieve groups stored in the database and retrieve articles of those groups from the NNTP servers.