StultitiaSimplex is available for Linux, Windows, and Maemo Fremantle (N900). A port to MeeGo / Harmattan is in work.
With StultitiaSimplex you can easily record short sound snippets and play them back. The user interface is designed to be as simple as possible. In the main window you simply have an array of buttons of configurable size where each button can be configured to play a different sound. The buttons are labeled with configurable titles.