SDF is released under the BSD open-source license.

The latest source release of SDF is:

• SDF 2.6.2 source bundle

A binary distribution for Linux/x86 is also available:

• SDF 2.5.1 linux binary distribution

The SDF bundle contains:

• the SGLR parser
• the SDF2 parser generator
• the Pandora formatting tool, based on Box.
• the ATerm library (C library)

There are continuous updates here:

• Continous Source Distribution
• Continuous Binary Distribution for linux/x86

Older releases can be found here.