a list of some of the more popular ones and their typical uplink and downlink frequencies:
AO-91 (RadFxSat / Fox-1B)
Uplink: 435.250 MHz FM (67.0 Hz CTCSS)
Downlink: 145.960 MHz FM
AO-92 (Fox-1D)
Uplink: 435.340 MHz FM (67.0 Hz CTCSS)
Downlink: 145.880 MHz FM
SO-50 (SaudiSat 1C)
Uplink: 145.850 MHz FM (67.0 Hz CTCSS)
Downlink: 436.795 MHz FM
XW-2A to XW-2F (CAS-3 Series)
Uplink: 435 MHz Band (SSB/CW)
Downlink: 145 MHz Band (SSB/CW)
(Note: There are multiple XW-2 satellites, each with slightly different frequency allocations.)
AO-07
Mode A (V/U): Uplink: 145.850-145.950 MHz SSB/CW Downlink: 29.400-29.500 MHz SSB/CW
Mode B (U/V): Uplink: 432.125-432.175 MHz SSB/CW Downlink: 145.975-145.925 MHz SSB/CW
FO-29 (Fuji-OSCAR 29)
Uplink: 145.900-146.000 MHz SSB/CW
Downlink: 435.800-435.900 MHz SSB/CW
ISS (International Space Station) - Amateur Radio
Voice and SSTV Downlink: 145.800 MHz FM
Voice Uplink for Regions 2 and 3 (Americas and Asia): 144.490 MHz FM
Voice Uplink for Region 1 (Europe, Africa, and the Middle East): 145.200 MHz FM
Packet Radio Uplink/Downlink: 145.825 MHz FM
QO-100 (Es'hail-2) - Geostationary Satellite
Narrowband transponder: Uplink: 2400.050-2400.300 MHz, Downlink: 10489.550-10489.800 MHz
Wideband transponder (DATV): Uplink: 2401.500-2409.500 MHz, Downlink: 10491.000-10499.000 MHz
This list is by no means exhaustive, and it's always a good idea to check with local and international ham radio societies or specific satellite organizations for updated frequency and satellite information. Frequencies, modes, and operational statuses can change, and new satellites are frequently launched, so always consult up-to-date sources before transmitting.