Drupal technical specification

Licensing Model: Free/Open Source, GNU General Public License, version 2
Current Stable Version: 5.x
Software Architecture: Web-based, Micro-core
Programming Language: PHP
Application Servers: Apache HTTP Server, Microsoft IIS, lighttpd, ...
Database Servers: MySQL, PostgreSQL, Microsoft SQL Server
Operating Systems: Windows, Linux, Mac OS X, *BSD, ...
Extensibility: Third-party PHP modules using callback mechanism
Scalability:
- Compatible with standard PHP accelerators (Alternative PHP Cache, eAccelerator, XCache, Zend Platform, ionCube)
- Compatible with standard Web application scalability techniques including caching, load balancing, database tuning, etc.
Integratability:
- Exposes and consumes RPC-XML and REST interfaces for Web Service integration
- Exposes and consumes RSS feeds for content syndication
- Integrates with LDAP/Active Directory, SOAP Web Services, Single Sign-On, and many other open protocols
- Integrates with other application platforms such as Java (through the PHP/Java Bridge)
Security:
- A list of security announcements is maintained on the Drupal site.
- Drupal is included on several specialized security advisory sites including OpenPKG, FrSIRT, etc.
Maintainability:
- Drupal coding conventions are published and enforced
- Drupal documentation is largely community-contributed yet active

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