I never played a Living Jungle game, but I was active in the RPGA at the time that it was running. It was a 2nd Ed. Living campaign (i.e. a campaign designed to be played at conventions where people would bring their own characters used exclusively for that game and generated according to standardized rules), like the contemporaneous Living City or the later Living Greyhawk. To the best of my knowledge, there were no published modules or supplements on Living Jungle's setting. There were several Polyhedron articles about it, and there may have been a couple of LJ modules published in Polyhedron-- I think so, but I can't remember for sure. You might be able to find copies of those old Polyhedrons. There were a lot of individual games made available through the RPGA, but those are no longer available. You might be able to find old-time RPGA DMs who still have copies and would be willing to share them.
My understanding is that opinions were heavily mixed. Some people really maligned the setting and the adventures-- I remember hearing complaints that instead of adventuring for treasure, you were adventuring trying to get shiny rocks. Other people really liked it and thought that it had a higher emphasis on role-playing than Living City did at the time.
