STFC Database is a storehouse of specific information about Star Trek Fleet Command. I don't think it has guides or strategy pages or crew suggestions. But if you want to know info about a specific ship, system, building, research, officer, or mission this is a really nice resource. I'm not sure it was an official site all along but now it seems to be run by STFC developers Scopely in STFC there are now info links that go to stfc.space pages.

Things I use it for:

Ships - Resource requirements to go from Tier x to Tier y. Also warp ranges at each tier.

Buildings - Resource requirements at each level and also if there are dependencies to get to that level. For events where I can spend a building resource I can estimate how many resources I'll spend before I hit a level cap or run out of that resource.

Officers - Mostly to look up synergy bonuses.

Missions - See if a mission is part of a chain and if so how many more missions. Also if someone mentions a mission I can look it up and see where you get that mission (if it's a specific system it says so, if not then the answer is unfortunately not helpful).

Unfortunately I haven't been able to do some searches, like "where is the mission to unlock XYZ path?" or "which officers are good against Borg?". For the latter I'll have to build my own spreadsheet of data.

Still, it's nice having all this info in a database you can search on.