Grapholite is an easy-to-use and still comprehensive online and desktop solution for designing professional-looking flowcharts, organizational charts, mind maps, Venn charts, database structures, web-site structures, etc. that can be used online and offline, in and out of browser; created diagrams can be stored locally and on the server.
"A flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet. Users without programming skills can create web applications. Developers can extend the functionality of TWiki with Plugins. TWiki fosters information flow within an organization, lets distributed teams work together seamlessly and productively, and eliminates the one-webmaster syndrome of outdated intranet content."