Essentials (SCE)

Maintenance Mode GUI Utility

Agent maintenance mode script and the group maintenance mode scripts in a graphical form so that people no longer need to be familiar with powershell or the operations manager console.

HealthServiceWatcher Connector

This OpsMgr connector eases the task of auto-ticketing and notifying computer owners of heartbeat failure associated with their systems.

Eventlog Explorer

Exposes sources installed on a local machine, design and fire user selected sets of events involving multiple sources with one button click. Great for identifying event parameter numbers for OpsMgr event filters.

Cleanup Tool for OpsMgr 2007

If the standard GUI fails for whatever reason you can rely on this tool. I have tested it in Windows 2003 Server, Windows 2008, both 32 and 64 bit platforms.