Here is how JUnivers versions are numbered : JUniversA.b.c.d.

A : Product release
b : Major release
c : Minor release
d : intermediary build (usually not published on this site)

Unpublished have a "d" build timestamp. They are generated for tests or for unverified bug fixes.

A changes very rarelly. When it changes, you can consider you're downloading a new product.
b is a major release and c is minor release; if c is "0", you can consider this version as a "production use" version. If c is greater than "0", the version is a test version. If tests versions are finally stables and relativelly "bugless", they are re-released vith a new version number like A.b+1.0.

Example :

3.0.0 : start version (yes, c=0 and it is an alpha version; but I had to start with a number !)
3.0.1 : 3.0.0 + minor modifications
3.1.0 : version 3.0.1 was stable, it is re-released with the 3.1.0 production version number.
3.1.1 : 3.1.0 + minor modifications
3.1.2 : 3.1.1 + corrections and other minor modifications
...
3.1.8 : 3.1.7 + a bug fixes
3.2.0 : version 3.1.8 was finally stable and is re-released with the 3.2.0 production version number.

There are three majors product releases of JUnivers. The first and se second version were based on an Oracle repository for the applications definitions dictionary and aren't more available.
The third version is based on XML files repositories.

You can browse the JUnivers file server clicking here : http://files.junivers.org/

You can download the last stable/production version here :

http://files.junivers.org/3.1.0/JUnivers3.1.0.zip is the standard distribution, with binaries, javadoc and used libraries,
http://files.junivers.org/3.1.0/JUnivers3.1.0Full.zip is the full distribution, with sources, binaries, javadoc and used libraries,
http://files.junivers.org/3.1.0/JUnivers3.1.0Src.zip is the source distribution, only with sources, javadoc and used libraries.

You can browse the 3.1.0 javadoc here : http://files.junivers.org/3.1.0/javadoc/