The KiWi core system is a flexible platform for building different kinds of semantic social software applications on top (currently the Semantic Wiki and the TagIT application). It provides all the core services required in such applications, like editing and tagging, the storage of content and associated meta-data, its own triple store, transactions and versioning over content and meta-data, a linked open data server, and many small features semantic social software developers will like (like convenience services for working with ontologies or SKOS thesauruses, etc.).
P6P is a decentralized public virtual network designed for traversing NAT. It's useful mainly for peer-to-peer applications that don't implement NAT traversal themselves. It uses an unrouted segment of IPv6 (Unique-local), so it doesn't collide with other networks. It does not implement any additional security.
YAJNGI (Yet Another Java NewsGroup Inspector) is a client-side service that allows you to keep tabs on a set of newsgroups without having to read constantly. You will be alerted only when the configuration finds your match. YAJNGI inspects a set of Usenet newsgroups using a perfect keyword, a regexp, or any phrases that you choose. It is multi-threaded and permits a different scan interval and actions for each group. It could be used to monitor newsgroups for your name, product, your favorite arguments, for downloading your favorite newest pictures or binary files, or any other topic of interest.