Add Drake & Lyft Envoy to the list of projects

README.rst

@@ -170,7 +170,14 @@ Projects using this library
 
 * `Lifeline <https://github.com/peter-clark/lifeline>`_: A 2D game
 
-* `MongoDB Smasher <https://github.com/duckie/mongo_smasher>`_: A small tool to generate randomized datasets
+* `Drake <http://drake.mit.edu/>`_: A planning, control, and analysis toolbox
+  for nonlinear dynamical systems (MIT)
+
+* `Envoy <https://lyft.github.io/envoy/>`_: C++ L7 proxy and communication bus
+  (Lyft)
+
+* `MongoDB Smasher <https://github.com/duckie/mongo_smasher>`_: A small tool to
+  generate randomized datasets
 
 * `PenUltima Online (POL) <http://www.polserver.com/>`_:
   An MMO server, compatible with most Ultima Online clients