- Google Mars -- Good for casual browsing.
- HiRISE -- Locate and browse highest-resolution (~15 cm/pixel) orbital images of Mars. Allows users to suggest new observations.
- Mars Orbital Data Explorer -- Powerful online browser with lots of datasets. Some familiarity with Mars orbiters and their instruments is assumed.
- JMARS -- Research-grade downloadable software supporting lots of datasets and advanced functionality such as 3D views.
Mars cartography -- maps of where stuff is on Mars.
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Global maps of Mars are generally made from imaging and other data obtained from spacecraft in orbit around Mars, such as the Mars Reconnaissance Orbiter. Here are some examples in order of difficulty: