Subtrees
These directories come from entire outside repositories brought in using git-subtree.
About git-subtree:
https://github.com/apenwarr/git-subtree
http://blogs.atlassian.com/2013/05/alternatives-to-git-submodule-git-subtree/
LevelDB
Ripple's fork of LevelDB is shared by the Bitcoin reference client project.
Repository
git@github.com:ripple/LevelDB.git
Branch
ripple-fork
LightningDB (a.k.a. MDB)
A supposedly fast memory-mapped key value database system
Repository
git://gitorious.org/mdb/mdb.git
Branch
mdb.master
websocket
Ripple's fork of websocketpp has some incompatible changes and Ripple specific includes.
Repository
git@github.com:ripple/websocketpp.git
Branch
ripple-fork
protobuf
Ripple's fork of protobuf doesn't have any actual changes, but since the upstream repository uses SVN, we have created a Git version to use with the git-subtree command.
Repository
git@github.com:ripple/protobuf.git
Branch
master
NOTE Linux builds use the protobuf installed in /usr/lib. This will be fixed in a future revision.
SQLite
Not technically a subtree but included here because it is a direct copy of the official SQLite distributions available here: