Geometric Dimensioning and Tolerancing (GD&T) software is used to create, analyze, and annotate engineering drawings with GD&T symbols and annotations. These software tools help engineers and designers ensure that the geometric dimensions and tolerances of a part or assembly are clearly communicated and understood by manufacturers, inspectors, and other stakeholders involved in the manufacturing process. Here are some popular GD&T software options:

1. CATIA: CATIA is a comprehensive CAD/CAM/CAE software suite developed by Dassault Systèmes. It includes GD&T functionality for creating and analyzing geometric tolerances in 3D models and drawings.
2. Creo GD&T: Creo, formerly known as Pro/ENGINEER, is a parametric CAD software developed by PTC. Creo includes GD&T capabilities for creating and documenting geometric tolerances in engineering drawings.
3. SolidWorks MBD (Model-Based Definition): SolidWorks offers MBD functionality for defining GD&T directly within 3D CAD models. This allows for the creation of GD&T annotations that are associated with specific features or surfaces in the model.
4. Siemens NX: Siemens NX is a CAD/CAM/CAE software suite that includes GD&T functionality for creating and documenting geometric tolerances in engineering drawings.
5. AutoCAD Mechanical: AutoCAD Mechanical is a specialized version of AutoCAD designed for mechanical engineering tasks. It includes GD&T tools for creating and editing geometric tolerances in 2D drawings.
6. PTC Creo GD&T Advisor Extension: This is an extension for Creo that provides advanced GD&T analysis and validation tools to ensure that GD&T annotations comply with standards and specifications.
7. Tolerance-Analysis Software: There are also standalone tolerance-analysis software packages available, such as CETOL or 3DCS, which can be integrated with CAD software to perform GD&T analysis and stack-up tolerance analysis.

These software tools typically offer features such as:

• Creation of GD&T symbols and annotations
• Associativity with 3D CAD models
• Analysis and validation of GD&T requirements
• Reporting and documentation of GD&T information
• Integration with other CAD/CAM/CAE software tools

The choice of GD&T software depends on factors such as the specific requirements of the project, compatibility with existing software tools, and the preferences of the engineering team.