This is the "rpki.net" toolkit developed and maintained primarily by Dragon Research Labs. It's had several other names over the years ("DRL RPKI toolkit", "ISC RPKI toolkit", etc), but it's the same toolkit under the same BSD-style license, now moved to GitHub.
There's a pile of documentation salvaged from the old wiki in the doc/ subdirectory: see the README in that directory for details.
Be warned that the existing documentation is for the "old-trunk" branch, which is not what you want to be using these days (among other reasons, because "old-trunk" depends on obsolete third party packages which are no longer supported by their respective authors). We will update the documentation for the current "master" branch as time and other work permits.
All commits to this repository on or after 2016-08-07 should be GPG-signed.
QuickStart guides for RP and CA on Ubuntu Xenial are here
Setup on other Ubuntu and Debian releases is similar, other than the APT URLs (below).
Binary packages for several Ubuntu and Debian releases are available from https://download.rpki.net/APTng/.
The source packaging scripts for FreeBSD are a bit stale, someday we'll fix that.
From 2006 through 2008, this work was funded by ARIN.
From 2009 through 2016, this work was funded by DHS.
Special thanks to Michael Elkins, who wrote the web GUI and generally served as a second brain and second set of eyeballs on a long list of thorny technical problems.