Charts.css is a really nice CSS data visualization framework. It comes with a 71,719 byte size CSS file and allows to dynamically convert tabular data to beautiful charts by just adding a few attributes (like class and scope)  is a really nice CSS data visualization framework. 

how to manage HTML DOM
with vanilla JavaScript only?
for modern browsers and IE 11+ 

Improve how you architect webapps
Patterns.dev is a free online resource design, render, and performance patterns for building powerful web apps with vanilla JavaScript or modern frameworks. 

Cross-platform toolkit for easy development of TUI applications 

We will observe two ways of doing this using native JavaScript, with no frameworks - one with revolutionary technology (Object.observe), and one with an original concept (overriding get/set).

Volt: A Bootstrap 5 Admin Dashboard Using Only Vanilla JS. Includes 11 example pages, 100+ components, and some plugins with no dependencies. 

A toolkit for building rich console apps for .NET, .NET Core, and Mono that works on Windows, the Mac, and Linux/Unix. 

I've been doing some work the last couple of weeks with Angular2. I really like it. Not just because it uses typescript, but also because it feels really natural and straightforward while working with it. No more string based dependency injection, or strange digest cycle stuff, it just seems to work. This last week I've migrated our beta-13 Angular app to the latest rc-1, and used that to keep track of the fun and easy stuff Angular 2 provides. Note though, that the application we're developing is really that complex, so I can only assume we'll run into more complex Angular2 features in the near future. For now, though, let me share some general tips and tricks we've encountered thus far (in no particular order). Oh, all examples are in typescript, since after using that, I really don't want to go back to plain old javascript (POJS?).