Off the top of my head there is the City-State Hong Kong, their suzerain bonus is a 20% production towards city projects, other than that I'm not sure, currently at work so can't confirm more than that
The Military policy card Integrated Space Cell gives +15% production to Space Race projects if the city in question has either a Military Academy or a Seaport. (A Military Academy on its own gives +3 production, so you'd probably want to have that anyway.) It unlocks with the Space Race civic.
There is also a Great Engineer (don't remember the name) that provides 20% to space race projects. Not sure if it applies to all cities or just the the city you activate him in.
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