Using git, you can check out the 4store source from GitHub at http://github.com/garlik/4store/tree/master.
If you want a snapshot tarball, don't get one from GitHub (it won't build correctly), look here: http://snapshots.aelius.com/4store/
Tarballs can be downloaded from the download directory.
There are Arch Linux 4store packages at http://aur.archlinux.org/packages.php?ID=33807
CentOS 6 instructions can be found at https://groups.google.com/group/4store-support/browse_thread/thread/154b9a734366672c/f03548848f052cfe?lnk=gst&q=CENTOS6#f03548848f052cfe
There are CentOS 5 / RHEL 5 RPMs available at http://4store.org/download/linux/centos5/
You can install them with:
rpm -Uvh http://4store.org/download/linux/centos5/4store-v1.1.2-1.x86_64.rpm http://4store.org/download/linux/centos5/rasqal-0.9.24-1.x86_64.rpm http://4store.org/download/linux/centos5/raptor2-2.0.0-0.x86_64.rpm http://4store.org/download/linux/centos5/mpfr-2.4.1-1.x86_64.rpm http://4store.org/download/linux/centos5/gmp-4.3.1-5.x86_64.rpm
But may need to install some things from yum first.
There's a Debian package in sid: http://packages.debian.org/sid/4store
There's a port for FreeBSD in progress at http://www.freebsd.org/cgi/query-pr.cgi?pr=161441
Mac OS X
There are mac applications in the Mac downloads directory which can be run from a .app. It opens a Terminal window, into which you can type 4store commands. It's also possible to add some liens to your bash profile or equivalent so that you can use 4store from any terminal.
HTTP servers started from the terminal that 4store.app opens can be accessed from anywhere on the machine.
There are instructions for installing on Ubuntu at http://blog.dbtune.org/post/2009/08/14/4Store-stuff. These might now be out of date though.
We would like to provide frozen VM images (eg. for VMWare), but noone has stepped forward to maintain these. If you would be prepared to maintain some, please contact us