TFS aggregator is a Server side plugin to automatically calculate or update work item fields based on rules. These are executed when the work item is saved on the server. The latest version can be found on GitHub.
There have been multiple incarnations of this plugin. You may have found it in any of these places:
Codeplex This server side plugin for TFS 2010/2012 enables dynamic calculation of field values in TFS. (For example: Dev work + Test Work = Total Work). It supports same work item and parent-child links. It also has support for aggregating string values (ie Children are Done so the parent is Done). Because this is a server side plug-in, it is very fast. The very first aggregation takes about 7-10 seconds (as it caches connection information). After that updates usually take place faster than you can refresh your client.
The latest version can now be found here:
This is a completely rewritten plugin which can execute C# script or Powershell and is trying to move away from the cumbersome and error-prone XML syntax of the old plugin.
