Site: https://regex101.com/
This is a website sandbox for learning [or testing] regex expressions. You are able to search the command repository for commands that may be of help for you, and then you are able to see your regex working in real-time, when run on provided test strings. This was invaluable when I was learning how to use RegEx, and I still go to this website when I am working on complex RegEx to validate how it will work.
Site: https://www.gitkraken.com/
Git Kraken is a heavily advertised Git GUI. It is a free application for open source projects and $50/year for an individual license. Prior to finding Git Kraken, I used Atlassian SourceTree, which is also on this list and is free. I found that GitKraken has an easier to use interface for almost all basic Git tasks. Atlassian has a better code diff tool and is able to perform more complex operations, which Git Kraken has some difficulty with.
Site: https://www.virtualbox.org/
This is the best free utility that I can found for spinning up virtual machines, without having a huge administrative overhead. Great for setting up linux machines to learn new technologies
Site: https://ninite.com/
When working on new machines, where it is common to install a bunch of applications all at once; this website can help by bundling applications into one installer. The website only bundles a handful of common, but safe, applications, so it is meant to provide a head start in setting up a new computer.
Site: https://getgreenshot.org/
This is screen capture software that replaces the Print-Screen functionality in Windows and Mac. A key benefit of this application is the built in image editor, which allows for highlighting, drawing of boxes, and blurring of areas of a recent screen capture. Definitely a great tool for professional looking screenshots in documentation or presentations.
Site: https://creativecommons.org/
A website used for searching photos with varying types of license restrictions.
Site: https://www.pexels.com/
Website with free stock photos
Site: https://color.adobe.com/create/color-wheel
This is a free tool for coming up with color palettes that can be used in Web and Desktop applications.
Site: https://jsfiddle.net/
This is a small sandbox for learning or testing different web technologies. You are able to have 3 panes for HTML, Javascript, and CSS; a fourth pane will then display the output, based on what you type in the other three panes. This website provides the ability to use numerous frameworks such as JQuery, Angular, React, etc.
Site: https://sourcetreeapp.com/
This is robust, free, Git GUI application. The interface can be intimidating at first, however, it provides all functionality that could be required for a GUI for the Git client.