Cirencester Wargames has a set of modifications for the popular Lion Rampant games to allow you to play games set in Early Imperial Rome.
The Miniature Wargaming Editor
Horde of the Dead Game
Horde of the Dead is a free print-and-play game of zombie survival.
Warmaster Ancients Late Roman Counters
The League of Ordinary Gamers offers sets of print-and-play counters for playing Warmaster Ancients without the investment of time and money. Their latest is a set of counters for Late Romans.
Destruction of Pompeii Animation
I loved this video animation of the destruction of Pompeii. What strikes me about it, though, is that there seemingly was ample time to get the heck out of dodge.