Curl ORB is to comunicate between Curl and server side java. It can generate Curl source code from POJO which stands for Plain Old Java Object, and invoke the java methods on server side from Curl application.
VJDBC (Virtual JDBC) is a JDBC type 3 driver which provides efficient tunneling of JDBC commands/results over different communication protocols (RMI, HTTP, HTTPS ...).
Remote Invocation Framework (RIF) is a framework for RMI that is 100% dynamic and uses WS over HTTP and HTTPS for brokering. Finally a framework exists to enable RMI with less that 6 lines of code including both the client & server side.
OrbGate is an 'CORBA Web extender' that allows to easily build Java CORBA clients capable to run in standard Java-1.1 compliant browsers using HTTP (or HTTPS) to communicate to CORBA servers.