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Easy to use free editing programs
Photoscape - Photoscape provides a number of features for the amateur including RAW image conversion, a number of edits, image combination and animated GIFS.
IrfanView - This freeware program is amazingly powerful. It handles multiple image formats, multimedia files, image scans and supports Adobe Photoshop filters. It provides the capability to do batch edits if you need to convert a number of files. You can also create text/image overlays for captions or watermarks.
GIMP - GIMP is a cross-platform image editor available for GNU/Linux, OS X, Windows and more operating systems. It is free software, you can change its source code and distribute your changes. Whether you are a graphic designer, photographer, illustrator, or scientist, GIMP provides you with sophisticated tools to get your job done. There are a number of 3rd party apps available for GIMP.
Paint.Net - Paint.NET features an intuitive user interface that supports layers, an “unlimited undo” to back out of any mistake no matter how disastrous, various special effects, and other tools. Where Microsoft Paint was able to do little more than resize images, Paint.NET is able to handle more advanced photo editing that you’d expect from Photoshop and other paid programs. This is a Windows only program.
Pixlr - Pixlr works a bit differently than the programs above because it is a web based editor. You don't have to install it on your computer. It is a robust editor allowing you to control layers and effects. I find it a little less easy to use than some of the others.
Houston Area Photography Groups
Digital Camera World Tutorials multiple tutorials on a variety of subjects
100 Helpful Photography Tutorials good stuff her for beginners to professionals
Area Photo Walks