KSP 2 parts
From Kerbal Space Program Wiki
If you're not looking for KSP 2 parts, you can try the stock parts page.
KSP 2 Parts are the basic science and rocketry items for exploration in Kerbal Space Program 2. The parts come in twelve major categories: Command, Fuel Tanks, Engines, Structures, Coupling, Payloads, Aerodynamics, Ground, Thermal, Electrical, Communication and Utility, with a total of over 350 of them.