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 formatting, integrated tracing and query execution breakdowns.
NEW VERSION 2.4.1: Toggle delimiter switch between US (,) and European (;), Intellisense improvements and many small fixes.
NEW VERSION 2.3: New Query History Pane, improved parsing of query plans & traces, support for SQL Server 2016, copy measure definition in editor, more configuration options, minor fixes.
NEW VERSION 2.2: new support to tracing for Power Pivot, basic implementation of IntelliSense, connect to Multidimensional SSAS Servers, support for multiple Power BI Desktop instances, highlight unnatural hierarchies.
Darren Gosbell wrote about the new features in DAX Studio 2.2.
DAX Studio is a project on CodePlex – visit http://daxstudio.codeplex.com to read the full documentation, download the installer and the source code.
Paul te Braak published an introduction to DAX Studio on his blog.