STIL is released under the terms of the GNU Lesser General Public License. It has been developed and tested under Sun's Java SE 8, but is believed to run under other 8/1.8 or later versions of the Java SE.
An attempt is made to keep backwardly-incompatible changes to the public API of this library to a minimum. However, rewrites and improvements may to lead to API-level incompatibilities in some cases, as described in Appendix C.3. The author would be happy to advise people who have used previous versions and want help adapting their code to the current STIL release.