Here’s my collection of propagation and mapping links curated from the web.
Propagation below 30 MHz
KC2G HF MUF and others Ionospheric propagation maps (MUF and critical frequency) by KC2G.
VOACAP HF Prediction. Predict your HF path and frequency.
VOACAP DX charts to predict your best chances
NVIS MUF (foF2) and others from Australian Space Weather Services
Propagation above 30 MHz
VHF – Based on realtime APRS reports. Zoom in on an area of interest and click about.
Sporadic E (EPI or Es Probability Index) from PROPquest
Worldwide Grid square locator. Quick and easy to use.