wikit is another wiki engine suited for small teams. It’s written in Haskell with using Yesod Web Framework. It’s cross platform and was designed to be running as a desktop service application servicing wiki articles and providing some basic capabilities in terms of searching and storing data.
It’s perhaps most distinct feature is that it relies on backing Git distributed source control system. And keeps it’s articles in markdown format.
Xcerpt is a Query and Transformation Language for XML and Semistructured data. Instead of the navigational approach of XPath-based languages like XSLT or XQuery, Xcerpt uses patterns for querying and is based on concepts of logic programming like unifica
Programming language based off pure type systems, and COQ. Currently aimed at both systems, and application programming. Has a simple syntax, and (planned) C integration.
Soutei is a trust-management system for access control in distributed systems. Soutei policies and credentials are written in a declarative logic-based language. Soutei policies are modular, concise, readable, supporting conditional delegation.
Kaya: A statically typed, imperative cross-platform programming language with type inference, powerful data description capabilities and built-in abstractions and libraries for easy and robust web application development. http://kayalang.org/
Functional Networked Integrated Environment (FUNNIE) is a networked CSCW programming environment specifically tuned to the needs of students and instructors, based on a subset of Haskell.
DebToo - Debian powered from source. Portage-like configurability brought into Debian with the goodies known to Gentoo users: USE flags, optimised packages, hand picked patches, fine grained tweaking performance, inherted configurations.
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A set of MediaWiki extensions and other tools developed for the Twelf wiki (http://twelf.plparty.org) that enable a wiki to naturally incorporate logic Twelf in a number of meaningful and useful ways.