Unigraphics is a former name for Siemens NX, an advanced CAD/CAM/CAE software application suite. However, veterans are still using the Unigraphics name.
In 2002, the new version of Siemens Unigraphics, merged with I-DEAS software, was released and called NX, which means "Next Generation". In fact, it was the last version of the software released under the Unigraphics name. All further releases became known as NX. So the addition of I-DEAS functionality to the core code of the Unigraphics has become the basis of the existing NX product line.
Siemens NX / Unigraphics use a .prt extension, which contains 3D CAD parts.
Tekla, owned by Trimble is a software product family that consists of programs for analysis and design. Tekla software includes several applications.
Tekla Structures is 3D BIM software widely used in the building and construction industries. The software allows users to create and operate 3D structural models in concrete or steel and leads them through the process from concept to fabrication.
Tekla Structural Designer is a software app for analysis and construction design. It is used by structural engineers.
Tekla Tedds is a software solution for automating repetitive calculations. It is used in engineering for creating output such as calculations, sketches and notes.
Tekla BIMsight is an application for building information model-based construction project collaboration.
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