RFC4055 describes RSAES-OAEP keys and RSASSA-PSS keys.
OpenSSL's genpkey utility supports let's you generate RSASSA-PSS keys (you have to set the aglorithm parameter to RSA-PSS) but if it supports RSAES-OAEP keys the documentation certainly makes no indication of that.
My question is... are there any third party tools that'll generate RSAES-OAEP keys for you?