On behalf of the developers of ABCL (Armed Bear Common Lisp) I'm glad to be able to announce the 0.17.0 release.
This release features - among lots of other things - performance improvements, a fix for unexpected thread termination due to uncaught exceptions and example code for running ABCL on Google App Engine. Please refer to the release notes for the full list.
If you have questions regarding use or licensing, or you find issues, please report back to the development list:
armedbear-devel at common-lisp dot net
Source distribution archives can be downloaded in ZIP (zip signature file) or gzipped tar (tar signature file) format. In addition, a ZIP binary (bin-zip sig file) and gzipped tar binary (bin-tar sig file) are available.