Simple editor for manipulating tags on your smartphone
OSMapTuner can be installed using Google Play ("the Android Market"). Currently, only Android 2.2 or newer is supported (mostly because of performance reasons).
Main purpose of OSMapTuner is "tuning the map" - this means, its features focus on on-site editing of tags: editing existing tags, adding new tags, removing wrong tags. To help you with this, OSMapTuner provides a feature named "Tag Validation" which can be activated in the options menu. There, you will also find the option to activate/deactivate layers, download data for offline editing, and preferences.
Tag validation is a feature which tries to highlight errors in features based on information provided in the OSM Wiki. Depending on the severity of the error, a feature will be shown "red" (probably a serious issue), "orange" (small issue) or "green" (probably no issue).
Currently, no support for editing relations or geometries is included.
A more detailed User Manual can be found at the OSMapTuner Website