Revit is a powerful BIM software that is widely used in the architecture, engineering, and construction industry. While it comes with a wide range of tools and features, there are also many add ins available that can further enhance its capabilities and streamline your workflow. Here are the top 10 must-have add ins for Revit that every architect and designer should consider adding to their toolkit.

1. Enscape: This real-time 3D rendering software allows you to create stunning visualizations of your Revit models with just one click. It provides a seamless integration with Revit and allows you to produce high-quality renderings quickly and easily.

2. Dynamo: This visual scripting tool allows you to automate tasks and create complex parametric designs in Revit. It provides a flexible and powerful way to manipulate data and geometry, and can greatly enhance your design process.

3. BIMcollab: This add in allows you to manage and communicate BIM issues more effectively. It provides a centralized platform for issue tracking and collaboration, making it easier to coordinate with project stakeholders and resolve issues efficiently.

4. IdeateApps: This collection of tools provides a wide range of utilities for managing and manipulating Revit elements. From batch renaming to sheet management, IdeateApps offers a suite of useful features that can help streamline your Revit workflow.

5. CTC BIM Project Suite: This comprehensive set of tools includes a range of utilities for managing Revit projects, from model cleanup and auditing to batch editing and sheet management. It can help improve productivity and ensure the quality of your Revit models.

6. VRcollab: This add in allows you to create and manage virtual reality (VR) experiences directly from your Revit models. It provides a seamless way to visualize and communicate design ideas in VR, allowing for more immersive and interactive presentations.

7. COBie Extension for Revit: This add in allows you to generate COBie data from your Revit model, making it easier to comply with COBie requirements for facility management and asset information exchange.

8. PlusSpec: This add in provides tools for creating accurate 3D models and construction documentation in Revit. It offers a range of BIM tools that can help improve the accuracy and efficiency of your design and construction process.

9. Lumion LiveSync for Revit: This add in allows you to synchronize your Revit model with Lumion, a popular real-time visualization software. It enables you to quickly create stunning visualizations and explore design ideas in a real-time environment.

10. UNIFI Connect: This add in provides a cloud-based content management platform for Revit, allowing you to easily access and manage your Revit content library. It helps streamline the process of finding and using Revit content, and ensures that your team has access to the latest content and standards.

These add ins can greatly enhance your Revit experience, and help you streamline your BIM workflow. Whether you're looking to improve visualization, automate tasks, or manage BIM data more effectively, there's an add in out there that can help you achieve your goals.