AutoCAD 23.1
After users learned to use CAD software on a personal computer (PC), many companies introduced CAD tools for the PC platform. In some cases, the PC versions of CAD software replaced the original version for dedicated hardware. Most CAD software today is a PC-based design application running on a standard PC operating system.
Several 3D CAD application packages were also developed, including Bentley Microstation and Microstation Onsite, both developed by Bentley Systems, a company which now specializes in 3D data capture and modeling.
Most free and open source CAD software runs under a Linux operating system, including FreeCAD, OpenCASCADE, and OpenCA.
History
In the late 1970s and early 1980s, early CAD vendors (including AutoDesk) did not offer CAD software for personal computers. However, the PC graphics market exploded in popularity by the late 1970s. Many CAD applications began to be developed for personal computers in the early 1980s, most for the DOS platform. Several different 3D CAD applications were developed around the same time for the PC, which competed with each other as their individual features and applications offered became more popular. 3D drawing and CAD software for the PC was developed by a variety of companies including Auralis, Bentley Microstation, CorVue, Concept I/O, Ecolise, Enginesoft, Maxon, Onshape, Pace, and SoCal CADD.
The first commercial CAD applications for PCs were developed by Autodesk in 1982 for the Apple II platform, enabling users to perform basic design and drafting tasks for the first time. AutoCAD was first available for the Macintosh platform in 1986, and was made available for the Commodore 64 and Amstrad PC 1520 shortly thereafter.
In the mid 1990s, the major CAD programs for the PC (including the various products from AutoDesk and AutoCAD) began to move towards 3D-based products in an effort to compete with the dominant 3D CAD market. Many of these early 3D-based CAD programs were first available for the Windows platform. One of the first 3D CAD programs developed for the PC was Concept I/O's FabDraft, which was later acquired by Bentley Systems in 2001. Concept I/O's successor, MicroStation, was released in late 2000. Concept I/O's FabDraft was based on Bentley Microstation, which was itself based on Bentley Microstation Onsite, an add-on application to Bentley Microstation for onsite data collection
AutoCAD 23.1 Crack +
Extensibility
 AutoCAD features are written in the Visual LISP programming language. Visual LISP is a general-purpose language, similar to Pascal, Perl and JavaScript. It has additional programming features (like objects and classes) that can be used to write extensions to AutoCAD. There is also a lightweight version of Visual LISP available for use in AutoCAD called QuickLISP. Visual LISP is described in more detail in Visual LISP and AutoCAD.
 Layers 
Autodesk provides a "command line interface" called AutoLISP, which is a relatively straightforward version of Visual LISP, that has been designed as a scripting interface for AutoCAD. It is used in AutoCAD and AutoCAD LT. Visual LISP also has a graphical interface that can be used to make Windows-like user interface for the editor; it can be used to control the editor and associated tools such as the color picker and command palette.
 The AutoLISP layer is used by both AutoCAD and AutoCAD LT and provides the editor with a command line window where the user can work in batches.
 Multilingual support 
AutoCAD includes an interface for all of the primary languages of the world. 
AutoCAD LT is fully multi-lingual in both view and script. As the name implies, AutoCAD LT was designed with a reduced feature set, which meant that multi-lingual support was not a key design goal. All the other tools and features of AutoCAD, however, are fully multilingual, and this works the same way as in AutoCAD.
AutoCAD (Partition II)
AutoCAD part2 is a cross-platform commercial release of AutoCAD.  It runs on all Windows platforms, and can be downloaded from the Autodesk Application Store, the Autodesk Software License Portal, or an authorized reseller. Unlike the previous version of AutoCAD (Partition 1), it is developed and supported by a separate entity known as Global Autodesk.
AutoCAD part2 has many of the same features as AutoCAD LT, but has significantly fewer features. Most of the more advanced features of AutoCAD LT, such as the direct-draw and draft construction tools, are only available in AutoCAD part2, and certain other features are only available in AutoCAD part2.
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