Fantasy Grounds 2 is one of the Big Boys in the Virtual Table Top arena these days. Its a fairly easy to use program with a relatively low learning curve for GMs that use prepackaged rule sets and adventure modules.
Castles & Crusades (C&C) is a licensed rule set for use with the Fantasy Grounds 2 VTT. If you've played D&D 3.X or earlier you should be fairly comfortable with the rules, which realy heavily on AD&D 1st edition for their feel and nostalgia. The original game rules are by the Troll Lords and are currently on my list of favorite games.
How well done is the conversion to an FG2 rule set? Very well done indeed. The VTT background artwork comes from the C&C Player's Handbook and fits the game well.
Pretty much every rule (if not every single rule) from the C&C Player's Handbook and Monsters and Treasures can be found clicking links under the book headings in the program. The character sheet plays well and I've yet to find a glitch in it after over six months of using it from the player's end (I'm playing in a weekly game).
Probably the best praise I can give for it is this: I tend to even forget it is there. It plays fluidly, both the rules and the rule set.
You can find the rules in PDF format as well as the rule set and modules at
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