Microsoft an ASP.Net MVC "Sample" (or is it a starter kit?) source code that can be used by Web developers to build blog engines into sites ... it's called "Oxite" and it's the software running the blogs on MIX Online. http://www.codeplex.com/oxite
Adobe AIR is a cross-platform runtime environment for building rich Internet applications using Adobe Flash, Adobe Flex, HTML, or Ajax, that can be deployed as a desktop application.
One word of caution: the "Typemock Isolator for Open Source" edition is only free to use for developers of open source projects. For Commercial users of any open source project that uses Typemock , it is not free...
NodeXL (formerly known as NetMap). An Excel 2007 template for viewing and analyzing network graphs, with a set of .NET Framework 3.5 class libraries that can be used to add network graphs to custom applications.
ZGRViewer is a 2.5D graph visualizer implemented in Java and based upon the Zoomable Visual Transformation Machine. It is specifically aimed at displaying graphs expressed using the DOT language from AT&T GraphViz and processed by programs dot, neato or others such as twopi.