Avigo TI-10 was a great little PDA released by Texas Instrument. By the time I found it, it was already discontinued, but the small developer community was very active. It was a real pleasure to develop for Avigo. All my releases are games:

• ACE, part 1
• ACE, part 2
• A Mazing Avigo
• Avigo Nonogrammer
• DRoboWHOids
• FlipFlop
• Loose Beans
• Unity