The SharePoint Framework Yeoman generator creates a new project with one Web Part. See how to easily add another one to your existing project.
You can use Angular to build Client-Side Web Parts on the new SharePoint Framework. Here is how to get started and what to keep in mind.
Now that the SharePoint Framework is released, here is how you would build your jQuery solution as a Client Side Web Part.
For every Client-Side Web Part that we build using the SharePoint Framework we can specify the icon to make it easily distinguishable amongst other Web Parts visible in the toolbox.
Seeing the changes to your Web Part properties immediately is great, but is it what you really want for every single scenario?