Website: http://code.google.com/p/sharex/
Description: ShareX is an open-source program that lets you take screenshots, save them in your clipboard, hard disk or upload them to over 20+ different remote locations. ShareX can capture screenshots with different shapes: rounded rectangle, ellipse, triangle, diamond, polygon and also free hand. It can also upload images, text files and all other different file types. It is able to capture screenshots with transparency and shadow. The program also supports drag n drop, and clipboard upload.
Comments: It's an incredibly useful program, I use it on a daily basis.
For completeness of submission, this is a .NET app, which means it won't be considered fully portable and would only be available in the upcoming .NET app section of the Portable App Directory (not shown by default).
Sometimes, the impossible can become possible, if you're awesome!
Start with -p or -portable
(Check here: http://code.google.com/p/sharex/wiki/CommandLineArgs )
Example bat file:
start ShareX.exe -p&&exit
or
start ShareXmod.exe -p&&exit
https://github.com/ShareX/ShareX/releases
ShareX 12.3.1 @Jaex Jaex released this on 19 Nov 2018
You can download
ShareX-portable.zip 5.48 MB
Source code (zip)
Source code (tar.gz)