These Microgaming Casinos offer Free Chips to new players.  Players must sign up for a real account to receive the free chips, but fun accounts are also available.

Only Progressive Jackpot games cannot be played with the fun accounts.  Also keep in mind that there are Terms for playing with free chips.  Each casino has its own Terms, and will also offer new players bonuses of 100% or more should they wish to make a deposit as well, but no deposit is required to play these free chips.