Platty Soft has developed a few apps on its own, check them out:

• AppAffinity: An app that recommends apps, in cooperation with LoopBit.
• Codemon (Barcode Monsters): A game about scanning barcodes, finding monsters and battiling other players.
• KendamApp: A tool for kendama players
• M:tG Tracker: A toll for Magic: the Gathering(r) playyers.