RegEx 101

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.

Ninite

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.

JSFiddle

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.