Palm OS
Some popular models: Sony Clie UX50 Series, Palm Centro, Palm Treo 680, Palm Treo 700p, etc.

Windows Mobile Pocket PC:
Some popular models: Sony Ericsson Xperia 2, HTC HD2, Samsung Omnia II i8000, Samsung OmniaPRO B7610, HTC Touch Pro 2, HTC Diamond 2, HTC Touch Pro, HTC Touch HD, Samsung i900 Omnia, HTC Diamond, Sony Ericsson Xperia, etc.

Windows Mobile Smartphones:
Some popular models: Samsung OmniaPRO B7320, Samsung SGH-i600, Samsung BlackJack II, Samsung BlackJack, Qtek 8500, Motorola Q 9h, Motorola Q, etc.

Symbian S60 3rd Edition:
Some popular models: Nokia E73, Nokia X5 01 Square, Nokia C5, Nokia 6700, Nokia 6760 - Surge, Nokia 5320, Nokia N96, Nokia N78, Nokia N95 8GB, Nokia N93, Nokia N75, etc.

Symbian S60 5th Edition:
Some popular models: Sony Ericsson Vivaz Po, Sony Ericsson Vivaz, Nokia X6, Nokia 5230, Nokia 5530, Sony Ericsson Satio, Nokia N97, Samsung Omnia HD i8910, Nokia 5800, etc.

Symbian UIQ3:
Some popular models: Motorola MOTO Z10, Sony Ericsson G900, Sony Ericsson G700, Sony Ericsson W960, Sony Ericsson P1, Sony Ericsson W950, Sony Ericsson M600, Motorola MOTO Z8, etc.

BlackBerry without touch:
Some popular models: BlackBerry Pearl 3G 9100, BlackBerry Bold 9650/9700, BlackBerry Curve 8900, BlackBerry Bold, BlackBerry Pearl, BlackBerry Curve, BlackBerry 8830, BlackBerry 8800, etc.

BlackBerry with touch:
Some popular models: BlackBerry Storm 2, BlackBerry Storm, etc.

Windows PC:
PCs that run Windows 7, Windows Vista, Windows XP, Windows 2000, Windows 2003 server or a newer system (Both 64bit and 32bit systems).

iPhone:
Some popular models: Apple iPhone 3GS, Apple iPhone 3G, Apple iPhone 2G, Apple iPod Touch, etc.

Mac OS X:
Apple's Mac OS X running Leopard Snow (10.6), Leopard (10.5), Tiger (10.4) or a newer system.

Samsung Bada:
Some popular models: Samsung Wave, etc.

Android:
Some popular models: Motorola Droid X, HTC Evo 4G, Sony Ericsson Xperia X10, Sony Ericsson Aino, Samsung Galaxy S, Motorola Droid, HTC Magic, HTC Hero, HTC Dream - TMobile G1, Google Nexus One, etc.