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In mathematics, a semigroup is an algebraic structure consisting of a set together with an associative binary operation. A semigroup generalizes a monoid in that there might not exist an identity element. It also (originally) generalized a group (a monoid with all inverses) to a type where every element did not have to have an inverse, thus the name semigroup.

Math::Expr parses mathematical expressions into a tree structure. The expressions may contain integers, real numbers, alphanumeric variable names, alphanumeric function names and most other characters might be used as operators. The operators can consist of multiple characters. The only limitation is that a variable or function name may not start on a digit, and not all chars are accepted in operation names.

Display runs a specified command over and over, printing the output through curses(3X). The command can be compound and the delay between executions is settable on the command line. The output from the command had better fit on a single screen, of course. This can conflict with the application of the same name from the graphics/ImageMagick port/package.

[ excerpt from developer's web site ] A cross-platform GUI editor, written in Python. It enables you to both create and edit metalinks in a user friendly fashion. The editor can automatically enter info about file name, file size, hashes & chunk checksums by scanning a local file.

Net::vCard - Read and write vCard files (RFC 2426). vCard files hold personal information that you would typically find on a business card. Name, numbers, addresses, and even logos. This module can also serve as a base class for other vFile readers.

Open Asset Import Library (short name: Assimp) is a portable Open Source library to import various well-known 3D model formats in a uniform manner. The most recent version also knows how to export 3d files and is therefore suitable as general-purpose 3D model converter. See the feature list.

Ayttm is an instant messaging (aka chat) client that provides all-in-one chat functionality for several major instant messaging services from one simple program. Ayttm "Contacts" allow you to refer to several accounts of the same person from a single contact name, making it one of the cleanest and simplest clients to use.

choparp is a easy-to-use proxy arp daemon. It watches arp request pack- ets visible on the interface specified by argument if_name, and sends proxy arp reply to the sender if the arp request queries the MAC address (ethernet hardware address) for the network speicified by net_addr and net_mask.

This module handles loading and saveing of .torrent files as well as providing a convenient way to store torrent file info in memory. Most users of the module will most likely just call the new method with the name of a existing torrent file and use the data from that.

H.323 Plus (or, "H323plus") is a multi-platform H323 Video Conferencing library formerly known as OpenH323. The new name was chosen to reflect the fact that the open source H.323 project now contains even more more functionality than ever before.