These are BOSCO tarballs for several platforms.
They are the stripped tarballs from the 8.6.2 release.
They were built in the NMI lab from the head of 
V8_6_2-branch (b2356074cc5c361).
The NMI run id was 404257
boscoinstaller is a copy of bosco_findplatform in the source tree.
bosco_quickstart is copied out of the source tree.