There have been no official release of Apache Wave.
The nightly binary build can be downloaded from here:
tar - apache-wave-bin-0.4-incubating.tar.bz2
zip - apache-wave-bin-0.4-incubating.zip
To run - open the archive and execute the run-server.sh or run-server.bat.
Please use the code from source, or refer to our latest release candidates (for prebuilds).
The latest release candidate of Wave is 0.4-rc4 (posted on 30 August 2013).
When downloading from a mirror, please be sure to verify the checksums and signature (see the MD5 and PGP links above). The KEYS file contains the public key(s) used for signing releases.