I was thinking about writing one, but 50 BTC "promised" in forum posts is nothing like 50 BTC in an escrow account. Get actual money into a kickstarter or indiegogo and it's a different story.
Show me devs competent of completing task and I will spend the painstaking time and effort to organize the escrow. Organizing the funds makes no sense if no one is agreeing or showing enough competence to complete task.