I learned about it a short time ago and decided to check it out. SAGA (System for Automated Geoscientific Analyses)- This one is new to me. It has many features that make the software package impressive and easy to use. The developers constantly revise and update the software adding more features and stability. MapWindow GIS- Is a windows specific program and another full featured GIS system. QGIS can run inside or a GRASS shell bring extended features into the QGIS system. As my friend Matt pointed out on Google+, QGIS' "strengths are in its graphical orientation were as GRASS is better at analysis and processing". QGIS (Quantum GIS)- a GIS system with an easy to use graphical user interface. This software is compatible with Arcview GIS formats. Grass GIS has been in development for over 20 years and used throughout the government and its agencies for spatial analysis. Grass works with 2d and 3d maps and images. Grass GIS - This is a powerful system and fully capable to today's standards for GIS applications. If you are looking for something that has many of the great features of Photoshop, this program is easy to use, and easy to navigate, and expandable. There is also an incredible library of plugins to extend Paint.NET's capability. There are layers and layer controls and the ability to save in a variety of Tiff, Jpeg, and Png files.
It is not going have feature for feature what Photoshop has, but for the archaeologist on a budget, it does amazing work. Paint.NET- A free drawing program with many of the great feature of Adobe Photoshop without the cost. I've posted an image here of a feature I drew. It will import files directly from Auto CAD (.dxf files), pdfs, Corel, Word Perfect, the list goes on! This program is great for digitizing field maps, plan views, feature profiles, etc. This program has a great feature set, and is an excellent replacement for Adobe Illustrator. A smart, slimline vector editor for your browser.Inkscape- A free vector graphics drawing program.This program is like iDraw only free, and you don't need a Mac or Ipad to use it. A sharp looking in-browser Illustrator alternative for stylish designs. A browser-based vector editor that’s as powerful as a desktop app. A feature-packed editor that’s a true substitute for Illustrator. How do I create a vector file without illustrator? If you don’t have a source vector file for your PNG file, then you’ll have to create a vector tracing it. It would be like trying to turn an omelet back into an egg. Since PNG is a raster format, there’s no way to directly convert it to a vector format. Scan your drawing instead of taking a picture of it (this way digitising your drawing will be much easier and quicker)
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