Though Fedmich's "Tongue Twisters" may come as a kiddie-oriented app, the mobile suite can actually also function as a speech improvement aid for adults.
Essentially a digital compilation of various tongue twisters, this mobile application features more than a hundred tongue twisters that can be used for regular speech and enunciation exercises - an app which can be utilized by educators and anyone who wants to improve his/her way of pronouncing words.