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When searching for online editing programs there needs to be a specific search. The most popular online editing programs are for photos can be found on sites such as TechRadar.
Editing programs
to edit graphics
If you are asking about 3 pic or picture editing that is the merging or three pictures into one. There are many photo editing programs that can help with overlay of photo, shadowing and editing.
I prefer Movie Magix Pro Edit (version 16 Hd). But, that's just my opinion. It is reasonably priced and a fantastic editing application.
Audacity.
Picnik, a popular photo editing website, is owned by Google. This program can download images to desktops as zip files and photos can also be copied to Google + for storage and sharing.
There are many programs one can use for video editing. Examples for video editing software are Windows Movie Maker, Kate's Video Toolkit, Avidemux, VSDC Free Video Editor and MPEG Streamclip.
word processorsdatabase programsWeb browsersdevelopment toolsdrawingpaintimage editing programsand communication programs.
There are many different programs that have text editing capability. A few options would be: LibreOffice, OpenOfficeDraw, Inkscape, PDFedit, Pdftk, and PDFSaM.
There are multiple good programs for editing pictures. A simple example would be Microsoft Paint, but there are also the much more advanced Adobe Photoshop and GIMP. You can also check www.photoshoponlinefree.com
Editing, compiling, linking, running and debugging Pascal programs.