Monkey

•  HTML5
•  Native OpenGL/OpenAL (Windows + Mac)
•  Android
•  Flash
•  iOS
•  XNA

Unity

• iOS
• Android
• PC
• MAC
• Xbox
• Wii
• PS3
• Html

Corona

• IOS
• Android

Marmalade

• iOS (3.0 and above)
• Android (1.5 and above)
• Symbian (Symbian^3 and S60 5th Edition)
• bada (all versions)
• webOS (1.4.1 and above)

PhoneGap

• Apple iOS
• Google Android
• Palm
• Symbian
• BlackBerry
• and more.

MoSync

• iOS
• Android
• Windows Mobile
• Symbian
• JavaME and Moblin platforms
• Blackberry and Windows Phone 7

ParticleCode

• iOS (iPad, iPhone and iPod)
• Android
• Windows Phone 7
• HTML5
• WebOS
• BlackBerry
• Flash
• J2SE
• J2ME
• Symbian
• Win32

Xamarin

• iOS
• Android
• Windows Phone

Moscrif

• Android
• iOS
• Symbian
• Windows Mobile
• Samsung Bada

Glideros

• Iphone
• Android

Leave a comment if I missed an SDK that’s suitable for cross platform mobile game dev.