Libraries for Altium

Component, Model and Library Concepts 

• Symbol (Graphic) 
• Footprint (Land-pattern) 
• Parametric Data (BOM) 

Library Software and Services

Library Philosophies (Nine Dot Connects)
PCB Libraries (Footprints and Step Models - Parts On Demand)

Library Types

IntLib Components (Integrated *.IntLib)
DBLib Components (Database *.DBLib)
SVNDBLib Components (Database *.SVNDBLib)
Components (Vault - Release Managed Content)

Database Libraries

Free Parts Access Database Library DBLib
ADLib (SQL Database - Web Interface)
Celestial Altium Database

Symbols Footprints and Step Models

Altium Design Content - Altium
Ciiva (Altium Extension - Linked to Altium Content)
Altium Legacy Libraries - Altium
3D Central Step Models
Altium Designer - Addons (Libraries and Scripts)
Free Integrated Library for Altium - Welldone Blog - FEDEVEL
Altium Library Arduino - Browse Files at SourceForge.net

That's it !