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Autodesk - free
Viewers
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Go to file Autodesk DWF Viewer 7 EN (build 928) - fast viewer for DWF files (incl. DWF 6, 3D DWF, multi-page, print to scale, merged lines, relative links, object properties, assembly tree, BOM, etc., for WinXP/2000 - to autoinstall visit www.cadstudio.cz/dwf) for Win98 use ver.6.5 -- obsolete, use Design Review External 14.9MB 15.6.2006 More information  
 
Patches + updates
3ds Max, Maya, Mudbox, MotionBuilder, VRED
Go to file Autodesk T-Splines Plug-in for Rhino (V3.4 for Rhino 5, Rhino 4) External 21MB 18.12.2012    
 
Free applications and CAD utilities (mostly our freeware & trials)
Our shareware (trial)
Go to file SplineConvert - convert splines, ellipses, arcs to 2D polylines (A2002, trial) 210kB 12.12.2002 More information Buy
Go to file SplineConvert 2006 - convert splines, ellipses, arcs to 2D polylines (A2006/2005/2004, trial) 210kB 15.6.2006 More information Buy
Go to file SplineConvert 2009 - convert splines, ellipses, arcs to 2D polylines (A2009/2008/2007, trial) 461kB 29.5.2008 More information Buy
CAD Utilities and add-ins
Go to file 2D3Dpoly - converts 2D polylines to 3D polyline objects (VLX Lisp for AutoCAD) 13kB 11.10.2016
V1.1
   
Go to file 2Dunfold - unfolds 2D curves to straight polylines (VLX for AutoCAD) 12kB 19.4.2009
V1.2
   
Go to file 3DF2L - converts 3DFaces to Lines/Plines (LISP for AutoCAD) 2530B 17.8.2021    
Go to file 3Dintcurves - find intersections between lines and 3D solids (VLX LISP for AutoCAD) 15kB 5.10.2021
V1.0
   
Go to file AddArea - add total area of polylines, regions and hatches by layers (VLX for AutoCAD) 21kB 9.12.2022
V1.6
   
Go to file AddLen - add total length of lines and curves by layers (VLX for AutoCAD) 11340 9.12.2022
V1.8
   
Go to file ASCPOINT.LSP - imports a coordinate text file into AutoCAD points, polylines or block copies (T.Tanzillo+CADstudio) 12kB 21.1.2020    
Go to file BreakAll + BreakObjects V2.x - breaks lines at intersections (automatic Break at intersection points) LSP by C.A.Butler - theSwamp.org 12308 5.1.2009    
Go to file BreakPls - breaks selected polylines at point objects (VLS Lisp for AutoCAD) 14kB 7.4.2020
V1.1
   
Go to file CADexcel - MS Excel plugin for importing XY/XYZ coordinate from Excel to AutoCAD (LT) points, polylines or blocks (also part of CS LT Extension) 894kB 27.4.2023 More information  
Go to file CADstudio FDO LineStyle 2010-2012 - generates line style symbols for FDO layers (AutoCAD Map, MapGuide) from drawing objects 2.6MB 2.3.2013 More information  
Go to file CADstudio FDO LineStyle 2013 - generates line style symbols for FDO layers (AutoCAD Map, MapGuide) from drawing objects 2.5MB 2.4.2013 More information  
Go to file CADstudio FDO LineStyle 2014 - generates line style symbols for FDO layers (AutoCAD Map, MapGuide) from drawing objects 2.5MB 2.4.2013 More information  
Go to file Centroid - draw center of gravity (CG/COG) point of polylines, regions and 3D solids, incl. volumes (VLX Lisp for AutoCAD) 16.8kB 3.4.2020
V1.1
More information  
Go to file CityGML - export simple polyline outlines from DWG to CityGML XML format (VLX Lisp for AutoCAD) 17kB 19.12.2012
V1.1
   
Go to file COT - Convert old table - converts lines, texts and blocks to AutoCAD TABLE objects (by J.Villarreal) 30kB 29.12.2020
V1.7
More information  
Go to file DivBreak/MMeasure - breaks polylines and curves to a defined segment number/length - combines the BREAK and DIVIDE/MEASURE (bulk Measure) commands 13kB 20.2.2023
V1.3
More information  
Go to file DrGrid - draw 2D or 3D or polar grid lines, optionally numbered (VLX Lisp for AutoCAD) 25kB 17.2.2024
V1.5
More information  
Go to file DTM - free Digital Terrain Model application for AutoCAD - TIN, volume, elevations, flowlines, meshes (VLX for AutoCAD and Map 3D) 47kB 19.10.2021
V1.5
More information  
Go to file FieldLink - draw temporary lines between fields and their source objects, incl. tables (VLX for AutoCAD) 13kB 3.10.2023
V1.7
   
Go to file FilterLL - filter LINEs by length (LSP for AutoCAD) 701 16.11.2010    
Go to file FixArea13 - fix polylines with overlapping segments for Area calculations in AutoCAD 2013 (VLX LISP for AutoCAD) 13kB 6.4.2013    
Go to file Gaps - mark gaps, loose ends on lines in a DWG (VLX LISP for AutoCAD 15kB 7.9.2019
V1.0
More information  
Go to file Hatch2L - hatch area between two boundary polylines (VLX LISP for AutoCAD) 17kB 4.1.2017
V1.0
   
Go to file INTLINES - draws points in all intersections of selected objects, lines, incl. self-intersections (cdnc5-02.LSP by B.Kramer) 4749 10.1.2014    
Go to file Lin2Cyl/Cur2Cyl - converts selected lines or curves to 3D cylinders or tubes (VLX LISP for AutoCAD) 17kB 10.1.2022
V1.0
   
Go to file Overlaps - finds any overlaps/intersections in a DWG file - texts, lines... (VLX LISP for AutoCAD) 19kB 12.1.2024
V1.0
   
Go to file PL2ML - convert polylines (LWPOLYLINE) to multilines (MLINE) - LISP/VLX 1508 11.5.2007    
Go to file PLDiet (PLD) - simplify LWpolylines, reduce number of vertices, weed (by B.Hailey, CAB, K.Cooper; LSP for AutoCAD) 9825 3.9.2018    
Go to file Pol2Cir - convert circular polylines and donuts to circles (VLX LISP for AutoCAD) 15kB 6.3.2016
V1.0
   
Go to file PurgeSmall - delete small elements (lines, polys, arcs, texts, blocks) from a DWG drawing file (VLX LISP for AutoCAD) 16kB 11.2.2021
V1.2
More information  
Go to file Region2Poly - convert 2D regions to polylines (VLX Lisp for AutoCAD) 12.6kB 1.3.2017
V1.1
   
Go to file RvrsLine - reverse direction of LINEs and POLYLINEs (LSP for AutoCAD) 3567 16.3.2008    
Go to file SelfIntersect - check for self-intersections, duplicate and zig-zag/retracing vertices in polylines (VLX LISP for AutoCAD) 15.5kB 30.5.2016
V1.4
More information  
Go to file SlopeTick - draw slope tickmarks (batter lines, hatches) between two polylines 15kB 8.10.2011
V1.4
   
Go to file Sp2Pl - converts selected splines to polylines (VLX Lisp for AutoCAD 2011+) 12kB 24.2.2012    
Go to file SVG Export for Inventor - exports unfolded sheetmetal outlines to SVG file, iLogic (CS+ utility) External 9kB 20.10.2017    
Go to file ToMulti - convert polylines to multi-lines by definitions in the .Tab file (VLX LISP for AutoCAD) 13kB 16.12.2019
V1.3
More information  
Go to file Triangle - construct triangular polylines defined by sides and angles, optional labels (VLX for AutoCAD) 17kB 1.6.2020
V1.2
   
Inventor
Go to file ImportCoord - reads Excel coordinates into Inventor as sketch splines, 3D splines or named 3D workpoints (Inventor 5/6/7/8/9/10/20xx, VBA by CAD Studio) 158kB 17.4.2014
V1.5
More information  
Other Goodies
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Go to file CISTEXT command - clean text from overlapping lines    
Go to file IRREG command - draw irregular lines    
Go to file KILLDOTS command - clean null lines, arcs and 'space' (whitespace only) text (R12-2005) 1.1kB 2.6.2004    

How to load a LISP application (.LSP/.VLX) into AutoCAD? See the Tip 7245.

Many other files also on Arkance Systems Helpdesk, CAD blocks in the Block catalog.