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

Tabular Editor is an editor alternative to SSDT for authoring Tabular models for Analysis Services even without a workspace server.  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

DAX Editor is an extension to SSDT that makes it easier to edit DAX measures in a Microsoft Analysis Services Tabular project.  Free download

SSAS Tabular Translator is an editor for the JSON translation files exported and imported by SQL Server Data Tools for a Tabular model in compatibility version 1200 or later.  Free download

SSAS Events Analyzer is a simple monitoring system that can be easily applied to any SSAS server with a minimal effort.  Free download

SSAS Activity Monitor is an open source tool to monitor the current activity (sessions, transactions, connections, and locks) on an Analysis Services instance. It works for both Tabular and Multidimensional mode.  Free download

MDX Studio is a tool that has been developed by Mosha Pasumansky, a former developer of Analysis Services. This is an invaluable tool to write a MDX query: you have a code formatting feature, an embedded system to analyze query…  Free download