MapMemo allows you to drag your files onto any graphic (map, photo, scan, illustration, screenshot, etc.), and thus give them a visual, location-based relation. It uses only aliases of your files which, when you click on an appropriate location, will open in their original application. You can use layers, info windows, colors, and comment fields to organize your files on the map.
Maemopad+ is a tree-based notes application with sketch support for the Maemo platform. Nodes are loaded on activation to keep the memory footprint as low as possible. It requires sqlite3 to work. Maemopad+ is not a port; it is designed and optimised specifically for the Maemo platform.
DataDrafter is a program that allows you to create your own interactive graphics applications with data editing, navigation, search, and reporting features built in. Use it instead of Visio, for example, to create diagrams, maps, and technical drawings that are interactive and fully integrated with your data. Your visualizations become real applications instead of just wallpaper. You can even share your graphics and data as an application on the Web, or on your own intranet.