AutoLISP/DCL
AutoLISP
- Tutorials
 - Developer's Guide
 - Reference Guide
 - Visual LISP Editor | AutoLISP Extension
 - What's New and Changed | Compatibility
 
DCL
ActiveX/VBA
AutoCAD ActiveX Library
Additional ActiveX Libraries
- Sheet Set Object (SSO)
 - Connectivity Automation Object (CAO)
 - CAD Standards Plug-ins (CSP)
 - Transmittal Library (ATO)
 
Managed .NET/ObjectARX/
      JavaScript
     Managed .NET
ObjectARX
JavaScript
General Resources
- CAD Management
 - Customization
 - Deploy Custom Programs with Plug-in Bundles
 - Digitally Sign Custom Program Files
 - DXF Reference
 
Connect
SDKs and Platforms
Online Resources
- Autodesk Developer Network Open
 - AutoCAD Developer Center (Documentation Updates and Training Videos)
 
Blogs
