| Aisling Dart | | Artist from Salem, Massachusetts describes her boxes. |
| Atlas Quest Letterboxing | | Trip planning portal offers clue search by country as well as tutorials and premium members services. |
| Dartmoor Letterboxes | | Introduction, tips and things to avoid, news, survey, and letterbox clues for the Dartmoor area. |
| DartmoorLetterboxing.org | | History of the activity, similar to orienteering, begun in 1854 at Cranmere Pool on the moor, and now popular in many countries. Offers a forum and contact information. |
| Der Mad Stamper | | Rubber stamp carver Mitch offers instructions on how to carve a stamp, and some examples. |
| First Finds | | Posts first finds submitted by new US letterboxers, organized by state. | |
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