The mapping tool we’ve been using is part of a suite of tools called RPTools. The mapping tool, called MapTool, is available for download at http://www.rptools.net/index.php?page=downloads . (Choose the most recent version, which will be at the top. If you use Windows, choose the zip file on the left. If you use a Mac, choose the .dmg file on your right. If you use Linux, you do not need me to tell you what to do.)
James has created a small web-page to help casters manage the spells they’ve prepared for a given day. This list currently contains the spells from the Core Rulebook for Bards, Clerics, Druids, Sorcerers, and Wizards. He may add Ranger and Paladin spells at some point in the future, but since he doesn’t know anyone playing these classes, it’s not a priority for him.
He’ll be happy to work with you to add spells from additional sources.
Wizards of the Coast provides a small, but useful, online dice roller at http://www.wizards.com/dnd/dice/dice.htm for when you do not have your own dice handy.