The current version is release 9a of 19-Jan-2014. This is a stable and solid foundation for many application's JPEG support.
You can find our original code and some supporting documentation in the directory files. There is a Unix format package in tar.gz archive format jpegsrc.v9a.tar.gz and a Windows format package in zip archive format jpegsr9a.zip. A collection of modified versions with adaptions and error fixes for system maintenance is available on jpegclub.org in the directory support.
To learn more about how to use JPEG, see the JPEG FAQ. If you'd like to learn about how JPEG works, start with the comp.compression FAQ.
The ISO/IEC JTC1/SC29/WG1 standards committee (previously known as JPEG, together with ITU-T SG16) had their own web site. IJG was not affiliated with the ISO committee.
IJG development continues. Advanced features are being prepared for coming releases...
The development site for new versions is at InfAI.org.