The best QSL information search engine there is, maintained by RW1QM
| Near-Real-Time MUF map | Current Gray Line Location |
| ARRL DXCC Countries List | DAWG X-ray Club |
| SEC's Radio User's Page (propagation) | Telephone Pioneers QSO Party |
| IPS Support For HF Radio in North America (propagation) | The best searchable program guide for Short Wave Listening (SWL) |
| Zero-Land Incoming QSL Buro | ARRL Outgoing QSL Buro |
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