These are BOSCO tarballs for several platforms.
They are the stripped tarballs from the 8.6.5 release.
They were built in the NMI lab from the head of 
the V8_6_5-branch (992419405fea251).
The NMI run id 416237
boscoinstaller is a copy of bosco_findplatform in the source tree.
bosco_quickstart is copied out of the source tree.