Here is an interactive map where you can explore and locate many Croatian Islands including the best and the most famous ones. If you click on the marker a little info box will appear where you will be able to click on the link that will take you to the full info page about each island.
There are currently more than five houndered islands in this guide - some of them are large(er) some are smaller, some of the island has full car access while some are accessable by boat only. Have a look:
Note: Using your mouse you can zoom into the map and move it around. If you would like to see a terrain map or satellite view of the islands, click on the 'map' or 'satelite' button in the top left of the map. Zoom menu and street view option is on the bottom right corner of the map.