PE0SAT: Satellite frequency list (beta).
Amsat-UK: Satellite list
DK3WN: Satellite frequency list
IARU Amateur Satellite Frequency Coordination
JE9PEL: Sat mode finder
JE9PEL/1 and UY2RA: Satellite frequency list
Klofas: CubeSat Communications System Table
If you experience that one or more frequencies are not correct, then please send me a message via the contact page and I will update the data as soon as possible.