Lee Mac LISP vs CAD Exchange
Lee Mac Programming (lee-mac.com) is the single best free AutoLISP resource on the internet — a meticulously curated, ad-free library of polished LISP routines and tutorials by a single author. CAD Exchange is a multi-seller marketplace covering LISP plus .NET, Dynamo, Revit add-ins, and Civil 3D plugins. Most CAD pros end up using both.
What Lee Mac Programming does well
Lee Mac's routines are extraordinarily well-written: clean code, full documentation, edge cases handled, and free. The tutorials are the best AutoLISP teaching material outside paid books. If you're learning LISP or you need a polished free utility, Lee Mac is the first stop.
What CAD Exchange adds
CAD Exchange covers what a single-author free site can't: hundreds of sellers across every CAD niche, .NET and Dynamo and Revit (not just AutoLISP), per-purchase license keys, refund windows for paid listings, and a Request marketplace for custom work. For depth and breadth across multiple software stacks and authors, the marketplace model fills a different need.
Side-by-side comparison
| Lee Mac Programming | CAD Exchange | |
|---|---|---|
| Cost | Free | Paid (with free listings) |
| Software coverage | AutoLISP only | AutoCAD, Civil 3D, Revit, Dynamo, .NET, ARX |
| Author coverage | Single author (Lee Mac) | Hundreds of sellers |
| License keys | Not applicable (free) | Per-purchase with revoke |
| Support | Author goodwill | Seller contact + refund window |
| Best for | Polished free AutoLISP and tutorials | Multi-software automation marketplace |
When to use Lee Mac Programming
Use Lee Mac for free, polished AutoLISP routines and to learn AutoLISP the right way. The tutorials are excellent.
When to use CAD Exchange
Use CAD Exchange when you need automation beyond AutoLISP (Civil 3D .NET, Revit Dynamo, ribbon plugins), when you need license tracking for paid tools, or when you need a marketplace with vendor accountability and refunds.
Frequently asked questions
Is Lee Mac on CAD Exchange?
We can't speak for any individual author. Lee Mac's site is the canonical home for his work.
Do I have to choose one?
No — most CAD pros use both. Lee Mac for polished free LISP; CAD Exchange for paid breadth across software.