digg(About) Digg is a technology news website that combines social bookmarking, blogging, RSS, and non-hierarchical editorial control. With digg, users submit stories for review, but rather than allow an editor to decide which stories go on the homepage, the users do.
Topics, aggregators, K-collector and other assorted stuff.(About) Our main goal is the development of an enterprise news aggregator that leverages the power of shared topics to present new ways of finding and combining the real knowledge in your organization.
Goal: a system to organize contents created with weblogs and personal aggregators and allow people to easily browse these contents at any time.
One of the keys of this system is that there are no pre-existing lists of topics that must be set up and configured. Topics get on the server via RSS feeds while users create them, and they are distributed to all other users within the same cloud via TopicRolls.
The basic idea is to allow for topics and posts to somehow self-organize without any top-down design approach
Croquet Project(About) open source software platform for creating deeply collaborative multi-user online applications. It features a network architecture that supports communication, collaboration, resource sharing, and synchronous computation among multiple users. Using Croquet, software developers can create powerful and highly collaborative multi-user 2D and 3D applications and simulations.