RawTherapee

RawTherapee is a free open source tool for photo editing.

These are some features of this tool:

High Image Quality

• 96-bit (floating point) processing engine.
• Non-destructive editing.
• Get the most details and least artifacts from your raw photos thanks to modern and traditional demosaicing algorithms: AMaZE, DCB, AHD, EAHD, HPHD, IGV, LMMSE, VNG4, Mono and Fast.
• Advanced color handling from white balance to HSV (Hue-Saturation-Value) curves, color toning and color management.
• Powerful CIE Color Appearance Model 2002 (CIECAM02) module.
• Enhanced exposure and tonality tools: tone and Lab curves, highlights and shadows tools, tone mapping (HDR-like effect), etc.
• Multiple denoising methods: luminance, chrominance (both rewritten in 2012), impulse (for salt and pepper noise) noise reduction.
• Several tools to enhance details: unsharp mask, RL deconvolution, contrast by detail levels. 
  
  
  Efficiency
  
• Multi-threaded algorithms for high performance (RawTherapee can utilize modern processor features, like SSE).
• Quick thumbnails load lightning fast and are replaced later with live thumbnails.
• Batch processing: convert all the developed images at once without loading the processor while you work.
• Copy/paste editing parameters from one file to many other. Partially copying and/or pasting is also possible.
  
• Basic tools immediately at your hands.
• Parallel editing of multiple images in separate editor tabs, and/or all at once from the file browser.
• An optional secondary display can be used.

Versatility

• Wide variety of supported cameras: almost all DSLRs and even some medium format bodies are supported.
• Can load most raw files including 16-, 24- and 32-bit raw HDR DNG images, as well as standard JPEG, PNG (8- and 16-bit) and TIFF (8-, 16- and 32-bit logluv) images.
• Can save JPEG, PNG (8- and 16-bit) and TIFF (8- and 16-bit) images.
• Advanced control over the algorithms with many fine-tuning parameters and curves.
• Can send to GIMP or the editing tool of your choice in one click (16-bit TIFF file).
• Command line usage besides the normal graphical interface.
  
• Various layouts: multiple tabs, single tab with filmstrip, vertical tab with filmstrip, dual monitor.

This wonderfull tool run on Windows, Linux and OSX


Download: http://rawtherapee.com/downloads

Install it in Ubuntu:

sudo add-apt-repository ppa:dhor/myway
sudo apt-get update 
sudo apt-get install rawtherapee

VSO Image Resizer

VSO Image Resizer is a handy free application that allows you to resize and convert photos in a completely automatic.
Supports various formats,
integrates into the shell of Internet Explorer,
allows the management of single or several pictures, has a history management and many other features


http://www.vso-software.fr/products/image_resizer/

Jahshaka

If you are looking for a free software for video editing I suggest you Jahshaka.
It 'an open source software that allows you to have full control of video,
effects in real time
ability to draw the image,
hardware acceleration,
audio editing
support for multiple audio and video formats
and much more.
In my opinion deserves to be tested


http://jahshaka.org/

PhotoFilmStrip

This free program lets you create videos from a series of images.

Allows you to create VCD, SVCD, DVD to HD, can put a background audio and apply different effects to video.


This application runs on Windows and Linux OS

http://www.photofilmstrip.org

Syntext Serna Free

Syntext Serna Free is a WYSIWYG XML editor.

it is well done and easy to use.
It can export in PDF format and has a lot of tool to edit and see your xml files.

Download it here

Alamoon watermark

Alamoon Watermark is a powerful watermarking software for protecting and enhancing your images.

Once you've selected the photos which you wish to apply the watermark, just select the type of writing and the position, Alamoon Watermark applcherà automatically written on every image.
Alamoon Watermark is able to save to different image formats.
There are two versions, the basic version is free to download, you have to pay for the more advanced.



According to me an instrument really well done

http://www.alamoon.com/watermark-editor.html