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August 26, 2011, 11:31 AM PDT Takeaway: Meeting Room Booking System is the right price for your DIY budget — free. Here’s how to start using the open source, easy to use, and flexible tool. Meeting Room Booking System (MRBS) offers a quick and easy way to book various people, systems, rooms, etc. MRBS is also free and easy to use, which has made a number of my clients quite happy.