Robert Estes (UCDavis - image compression research). Robert has pointers to many of his papers on this page. He has info on Wavelet-based image compression, image compression, plus some peripherally related topics such as image quality.

http://msp.cipic.ucdavis.edu/~estes/

HP offers some free JPEG-LS software, including a Windows DLL, PhotoShop plugin, and reference executables good on several platforms, including Windows, Linux, Solaris, and of course, HP-UX.

One anonymous reader dissed the package with this comment: Not particularly user friendly.

http://www.hpl.hp.com/loco/software.htm

JPEG-LS is the new lossless/near-lossless compression standard for continuous-tone images developed by ISO/IEC JTC1/SC29/WG1 (final draft international standard FDIS14495-1 as of Novembr 1998). The standard is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard Laboratories

Update: The HP site has just added a JPEG-LS plugin for Photoshop, in addition to the HP implementation that has been there for some time.

http://www.hpl.hp.com/loco/

by David A. Clunie. A preliminary implementation of JPEG-LS.

http://www.dclunie.com/jpegls.html

Lots of pointers here. Relevant to compression because of the wealth of pointers to various formats used in medical imaging, such as JPEG-LS and Lossless JPEG.

http://www.faqs.org/faqs/medical-image-faq/part7/

A free implementation of the upcoming JPEG-LS compression standard.

http://www.stat.columbia.edu/~jakulin/jpeg-ls/mirror.htm

Software for H.263, JPEG-LS, and JBIG-2. Follow the links to Software. Many publications as well.

http://spmg.ece.ubc.ca/

by Xiaolin Wu, University of Western Ontario. A paper on the CALIC algorithm, first presented at DCC 96. This file is in PS format.

ftp://ftp.csd.uwo.ca/pub/from_wu/papers/dcc96.ps

A final draft of the JPEG-LS document. This is not the standard, but it is bound to be pretty close. The doc says:
This document is the final committee draft of CD 14495, Lossless and near-lossless coding of continuous tone still images (JPEG-LS) agreed by ISO/IEC JTC1/SC29 to be made available for public comment on WG1 web site, www.jpeg.org.

http://www.jpeg.org/public/fcd14495p.pdf

As it says, this is the home site of the committees. You need to be a member to access some areas, but there is plenty of information here for the common man as well.

http://www.jpeg.org/

A freely redistributable lossless JPEG codec. Encoder, decoder, man pages, full C source, and some documentation.

ftp://ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z