Use only official sources.
Before looking at third-party tools, ensure you have the "must-have" add-ins provided directly by Autodesk. download revit extensions for autodesk revit 2018 best
PyRevit is a powerhouse. It adds dozens of tools: batch rename views, align grids, create color-coded legends, and automate sheet numbering. For Revit 2018, you need PyRevit version (later versions break compatibility). Use only official sources
For Autodesk Revit 2018, the "best" extensions are a mix of official Autodesk tools and essential third-party add-ins that streamline documentation, rendering, and data management. Official extensions are primarily found in the Autodesk Account portal, while third-party tools are available on the Autodesk App Store Essential Revit 2018 Extensions & Plugins Revit 2018 How to Add Revit Extensions create color-coded legends