  We explore the properties of five-dimensional supersymmetric gauge theories
living on 5-brane webs in orientifold 7-plane backgrounds. These include
$USp(2N)$ and $SO(N)$ gauge theories with fundamental matter, as well as
$SU(N)$ gauge theories with symmetric and antisymmetric matter. We find a
number of new 5d fixed point theories that feature enhanced global symmetries.
We also exhibit a number of new 5d dualities.
