A list of all DAX functions and help with how to use them
Automatically format your DAX
M code examples and documentation(Rick de Groot)
A quick way to analyze your data model and format your DAX. Includes ability to Export Tables to CSV
Productivity Tool for the developer of Models. Write DAX in a separate UI, calculation groups, scripts, debug and more. V2.0 is Free
DAX optimisation tool. Plus ability to export tables to CSV (watch video)
Locate and remove unused columns and measures(Gregor Brunner)
Find which measures and columns are used in your report(Imke Feldmann)
Visually analyze where fields are used in reports (Stephanie Bruno)
A one-stop-shop for all the latest versions of many External Tools.
Performance Tune your model(SQLBI)