Homebrew to make libevent and other package installation easer?
RESTful API tools
While discussing the issue that some third-party tools that may not be gevent-aware, it was asked if the psycopg2 library is gevent-ready.
It looks like (see here and here) simple patches are available for psycopg2, but that even then you might want to do some connection pooling. Many blog entries have been written about the topic and I haven't investigated deeply yet.
Anecdote: For a different database (mysql) I once tested a almost-pure-C option versus a pure-python option. For a single connection the pure-C option was faster, but as long as there were even a few processes using the library concurrently then pure-python library, which automatically was greenlet-aware, was much much faster.