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The Microsquirt ECU is both open source and open architecture. This is what Greg737 uses I believe. That is, you can download the schematic and build your own if you wanted to. Should it ever fail, there are a number of manufacturers that can sell you a new one.
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Yes, I use the Microsquirt ECU. Love it, it's a very good product from some guys who really know FI. My Microsquirt is now known as "the old version" as the people at Bowling&Grippo have come out with a better, smaller version of the Microsquirt ECU.
One correction about what you said regarding the Microsquirt: The Microsquirt is really small and uses tiny surface-mount components which would make it difficult to work on at home (at least I don't think I'm up to the task of de-soldering, removing and re-soldering those itty-bitty components). The other Bowling&Grippo products, the Megasquirt ECUs are all built with larger components and are commonly sold as kits and build at home by people with very little prior electronics experience.