SharePoint CSR Live Edit
This extension is for SharePoint Developers. It makes process of creating SharePoint Client Side Rendering customizations many times faster. The customizations will be applied as-you-type to the underlying SharePoint page. Cisar provides CSR-tailored intellisense and tight integration with the underlying page.
Cisar supports Office 365 as well as on-premise SharePoint 2013. List forms, list views, list views in Edit mode and search results can be customized.
Extension is open source and free. Source code is available on Github: https://github.com/andrei-markeev/cisar