this website used to be pretty good for job postings, I have tried it lately and the job links for the different instruments don't work.

Does anybody know if it's just not being maintained?

http://www.classicweb.com/Jobs.htm

Musicalchairs has many jobs, but at times not all of them. Any other free resources?

I've seen http://www.myauditions.com/ it has postings. I'm not really looking for a job but had all of the openings I heard about for american orchestras and international ones too. To access the info you have to sign up (its free) but you can search and see who needs what.