Here are just a few of the free tools that I use for the development of my websites and apps.
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With all the extensions available, it is a great tool for the development of websites, and scripting in languages of all kinds.. If you do any work with containers / kubernetes, VS Code is an essential in your toolbox.
Bonus: it's available on any computing platform you probably program on.
You may hear other tools do the same or better job for .net app development, but those tools don't have the same Team behind them. Visual Studio is the best tool for the development of .net applications. Period.
Bonus: Available for the MAC.
Sometimes you need to analyze files on a line by line comparitive way. I can find no other tool that does this better than Behond Compare. I can't say enough good things about this tool. It not only allows you to analyze files line by line, but entire directories for differences in files based on content, binary etc.
Code Beautify is a free and online open source code beautifier and parser for all things web. It can be used to parse Json, encode and decode files to base64.
Bonus: All platforms