DAX Studio is a tool to write, execute, and analyze DAX queries in Power BI Designer, Power Pivot for Excel, and Analysis Services Tabular. It includes an Object Browser, query editing and execution, formula and measure editing, syntax highlighting and…  Free download

VertiPaq Analyzer is useful to analyze VertiPaq storage structures for a data model in Analysis Services Tabular. A complete description and short tutorial is available in the article Data Model Size with VertiPaq Analyzer.  Free download

DAX Date Template is a Power BI template file containing a fully-featured Date table. This template spares the user from writing the required DAX expression – as well as in setting the necessary properties to define display format, hierarchies, and…  Free download

Power Pivot Utilities in an Excel add-in (based on a collection of VBA macros) that helps documenting PowerPivot models and facilitates the creation of pivot tables connected to the data model.  Free download