Who Has My Stuff is a free Android application developed by Stephan Windmüller under an open-source license. It falls under the category of Business & Productivity and is compatible with Android 13.0 or later. This simple application aims to help users keep track of their lent items, such as books, and remind them of the expected return dates.

Who Has My Stuff allows users to define a description, date, and contact person from their address book for each object. The app also integrates with the user's personal address book, keeping track of the history of returned objects. In addition, users can add calendar events for expected returns and backup their data to the SD card.

Overall, Who Has My Stuff is a simple and useful app for those who tend to lend items and forget about them. The app's integration with the address book and backup feature make it a reliable tool for keeping track of lent items.