- CCD Images of Messier Objects
 - Messier45.com
- Includes a gallery of Messier objects, Herschel 400, and the Deep Sky Browser, an easy to use front-end for the Deep Sky Database which includes information for deep sky objects and stars.
- SEDS Messier Database
- A complete guide to the 110 objects recognised as the standard Messier catalogue, each with an image and a short description.
- The Messier Marathon
- Messier Marathon web site explains history, controversy, and search sequence for attempting to find as many Messier objects as possible in one night.
- Ultimate Messier Object Log, The
- Freeware database that contains relevant information for all 110 Messier Objects and various layouts to assist amateur astronomers in documenting their search for deep sky objects.
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