ACrush

.NET Extensions Methods Library for C# and VB.NET (ASP.NET, MVC, SL, WPF, EF)
.NET Graph Library
7-Up: PowerShell Scripts for Upgrading SharePoint 2007 to 2010
7zbackup - PowerShell Script to Backup Files with 7zip
Active Directory Tools For SharePoint
AD User Editor WebPart
Add web part page quick search extension for SharePoint Server 2007
Advanced Alert for SharePoint
AJ MOSS Administrator
AJAX Control Toolkit
Ajax TreeView
Ajaxify MOSS
ALM Specialist Toolkit
Application Page Builder
Architecture Layer Patterns For Visual Studio
ASP.NET Controls Library
ASP.NET Exception Reporter (based on ELMAH)
ASP.net MVC Awesome - jQuery Ajax Helpers
ASP.NET Social Bookmarks
Auto Complete for MOSS 2007