Code Spell Checker
This appears to be the best spell checker available. There are many available dictionaries including software terms, company names and more. It’s easy to add words to the projects dictonary too.
This is built in to the full Visual Studio and wish it was built-in to VS Code too, so for now make do with installing this as an extension.
Simply displays the current file size in the footer. As a bonus you can click it to see the calculated size if gZipped.
Essential tool for linting.