I’m excited today to announce that we are also releasing the ASP.NET MVC source code under the Microsoft Public License (MS-PL). MS-PL is an OSI-approved open source license. The MS-PL contains no platform restrictions and provides broad rights to modify and redistribute the source code. You can read the text of the MS-PL at: http://www.opensource.org/licenses/ms-pl.html

In an unforseen move Microsoft has announced the release of the Windows 95, 98, Me and MS-DOS source code for today only. Microsoft Chairman Bill Gates said that "by releasing the code for these operating systems we are allowing software developers worldwide to create better applications for these systems".

WhiteHouse.gov released custom code used to develop their open platform built on Drupal. The majority of the code used in the web site of the White House is already open source, but developers are now releasing new code -distributed as Drupal modules- in order to benefit others.

Most developers are at least passingly familiar with the notion of code review - that having source code read over by another developer, or a group, is a good way to catch things that the original author missed.

The visibility of the source code is an essential element of Linux and free software, but reading the source is not always the best way to discover what the coder intended - which is not always the same as what the code actually does.

OpenArena is a FPS game intended to be a free replacement for the proprietary Quake III Arena. Both the media and the game are licensed under the GPLv2.[1][2] The latest version of the game is version 0.8.1 released on October 31th, 2008.[3] The OpenArena project was established on August 19, 2005, the day after the id Tech 3 GPL source code release.

Hewlett-Packard is releasing to the open source community the computer code for a software programming interface that helps manage large data sets in high performance computing environments.

Last month we reported on four indie games going open-source that were part of the pay-what-you-want "Humble Indie Bundle" after the developers experienced very favorable returns. The source-code to Aquaria has now been published with the source-code to the three other titles (Lugaru, Gish, and Penumbra Overture) already being available.

Business users of open source software should review their Open Source licensing agreements, audit their use of Open Source and create formal policies for managing source code, especially mixed-source code.