1. Mobile Icon Set
Includes Phone Call, Photos, Messages, Calculator, Wireless, Calendar, Settings, Contacts, Notes and Map all with the sizes: 128, 64, 48 and 32px.
2. 30 Free Vector Icons
In this icon set there are 30 free vector icons with an apple touch and feel about them and perfect for mobile app development. The download contains the .psd source file.
3. Free iPhone Toolbar Icons
These icons have been developed specifically for iPhone developers, completely free for anyone to use commercially.
4. Gesturecons – Multi-Touch Icons
These vector based icons have been created to help in the design, development, implementation and promotion of multi-touch interfaces.
5. Android Developer Common Icon Set
The design and style of these icons have been based on some of the icons that are contained within the Android SDK. In total there are 24 .png Glyphs with the option of the following sizes: 16×16, 24×24, 32×32 and 48×48 pixels.
6. Android Developer Common Icon Set II
This icon set contains icons designed for use in the Menu, Lists, Tabs (selected and unselected) or Dialogs, with the correct sizing sorted into appropriately labeled folders.
7. iPhone Toolbar Icon Set
This set of 64 icons for the iPhone toolbar that contain beautiful shaded portions to give added depth and to highlight the icon features.
8. 130 Glyphish iPhone Icons
The Glyphish icon set have designed and carefully optimized specifically for use on toolbars and tab bars in iPhone apps, but would also be perfect for Android Development.
9. Android Icons
This Android developer icon set includes 30 .png menu icons plus the additional source files (.eps) for further customization.
10. 108 Mono Icons (Minimal Icons)
The icons are available in 32×32 px .png (transparent background) format. This icon pack comes with 108 gray icons, but you can easily customize the color.