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With eQuest you really have to manage your expectations of what support means. The biggest thing is that it is free and not directly funded by a government entity on a continuous basis (by this I mean like E+). As a tradeoff, the program has always been "unsupported" in the sense that you don't get direct support/help from the developers. However, entities like the eQuest Users Group at onebuilding.org quickly bridged this gap by allowing other practitioners to volunteer their time to help others with problems. Many people thrive in this structure and prefer it to other business models.

Also, eQuest releases don't work like many other software packages with regular updates every 6 months. You may have 2-4 years without an update, but this doesn't mean that the program has been abandoned. A big reason for the this is that the code base for DOE2 goes back 30+ years, so most of the accidental bugs have been fixed. Therefore, updates to the program are almost entirely additions rather than bug fixes. Other newer programs require a 6 month rolling release just to keep up with newly discovered bugs.

As far as the addition of specific pieces of equipment to the program goes, I don't think you can ever guarantee that this will happen (although past evidence shows that it does eventually happen). But I don't think this should deter you from using the program. Long time users understand the framework of DOE2 and the environment in which it was built and therefore know when it is the best tool for a specific task. If you still feel uneasy about the future of eQuest, just remember that this question gets asked a lot, and yet the software goes on...