SourceCode and Compiled Binaries for two low-level system information tools: NtSysInfo explores Windows internals and enumerates system processes, windows, threads, objects. The WhoUses utility allows you to determine what process has a file or DLL locked.
A bunch of SQL Server related downloads, including the driver for PHP, the Sync framework, reporting services addon for SharePoint, Analysis plugins for Office, etc.
SheepShaver is an Open Source PowerPC MacOS run-time environment. That is, it enables you to run PowerPC Classic MacOS software on your computer, even if you are using a different operating system.
A slick Shell Namespace extension for Windows Vista to allow you to browse and search the registry in Explorer. Looks really nice - licensed under Ms-PL
Access to tested generators, a designer for building your project,
FXCOP'd source files, XHTML,
NUnit Testing Code, VS.NET 2005/Express solution files and SQL scripts.
Idera has a new FreeWare version of their SQLsafe tool for backup and recovery of SQL Server databases. They've also added freeware versions of their performance monitoring tool and are preparing more free tools...
xacc is an opensource multi-language IDE written in C# ... it handles syntax highlighting etc for everything from Boo and C# to Ruby and Perl, to Caml, F#, Scheme and Lua, and even Yacc, Bison, Lex and Flex ... and PowerShell.
It has project support for C#/C++, Nemerle and Boo, and Yacc/Flex, NSIS, etc.