There are various web-based image editors that help a lot specially when you do not have the right image editing software with you.
AIE, an open source Ajax image editor, is one of them but with a difference: it can be installed under your websites.
So, besides using it as a standard image editor, it can be integrated with other applications you use (like image galleries, blogging apps., etc) by simply setting the "images folder" of these applications.
AIE has great features like:
- resizing images
- cropping images
- rotate/flip images
- apply filters
- add text with a text tool
- apply watermarks & more..
It is built with Ext JS & uses PHP+ImageMagick on the server-side. For a demo, click here.
Compatibility: Mozilla, Internet Explorer