When transitioning from CAD to BIM (Building Information Modeling), choosing the right software is crucial for efficient workflow, accurate modeling, and effective collaboration. Several industry-leading tools can be used in CAD to BIM services depending on the project requirements, level of detail, and file compatibility.

1. Autodesk Revit:
Revit is the most widely used BIM software for architectural, structural, and MEP modeling. It allows users to convert 2D CAD drawings (like those from AutoCAD) into 3D intelligent models. Revit supports parametric modeling and offers tools for clash detection, scheduling, and collaboration, making it ideal for CAD to BIM conversion.

2. AutoCAD:
While AutoCAD is not a BIM software itself, it plays a foundational role in the CAD to BIM workflow. Many legacy drawings are created in AutoCAD, which can then be imported into BIM platforms like Revit for modeling. AutoCAD also offers a specialized toolset for architecture that simplifies the migration process.

3. Navisworks:
Navisworks is used for BIM coordination and clash detection. After converting CAD files to BIM models in Revit, Navisworks can help integrate different trades and detect clashes in large-scale projects, which is crucial in BIM-based project delivery.

4. ArchiCAD:
Developed by Graphisoft, ArchiCAD is another powerful BIM tool used by architects. It supports direct import of CAD files and allows users to build 3D BIM models. ArchiCAD is known for its user-friendly interface and is a strong alternative to Revit in many European countries.

5. SketchUp + Trimble Connect:
For simpler or conceptual models, SketchUp (with BIM plugins) can be a lightweight alternative. It allows importing CAD drawings and converting them into 3D models. Using Trimble Connect, users can also collaborate in a BIM environment.

6. Bentley Systems (AECOsim Building Designer):
Bentley's BIM tools are ideal for infrastructure projects and are often used in transportation, utilities, and large commercial developments. They support CAD file conversion and provide robust modeling features.

Conclusion:
For effective CAD to BIM services in United States, Revit remains the industry standard, but depending on the scope and complexity of your project, tools like ArchiCAD, Navisworks, or Bentley AECOsim can also be excellent choices. Always consider software compatibility, collaboration features, and client preferences when selecting the right tool.