Photography (471 programs)

Pros: Frees up valuable digital real estate. Makes sharing pictures online easy and quick. Different compression modes. Batch processing capabilities.

Cons: Cannot take the size down too much. Loading multiple images could take considerable time. Certain file types may not work with all modes. Mildly complex user interface.

Pros: Extensive camera support. Non-destructive editing. Customisable presets. Real-time GPU acceleration.

Cons: Mac OS 10.12.2 or later only. No option to change UI colour. No "de-haze" function. Only a basic set of editing features.

Pros: Export from iPhoto. No upload limitations. View existing Picasa albums.

Cons: Not easily accessible from iPhoto.