CamlJS Console with live preview.
Free and open source development console for creating SharePoint CAML queries, with live preview against real lists and libraries. Uses CamlJs syntax.
Install the extension, navigate to your SharePoint portal, click the extension action button. In the topmost editor window, create a CamlJs query. You will see the generated CAML Query right as you type. Then, switch to the "Data preview" tab, select a list, and the query will be run against the selected list.
CamlJs editor window provides syntax highlighting and intellisense. Intellisense is enhanced by adding the fields of the selected SharePoint list into the code completion list.
The extension is open source, the source code is hosted on GitHub. Please post bug reports, feature requests, etc., to GitHub.