Indeed, Opa checks the type safety of the application over the whole application, from client, to server, to database. Opa also provides many automation algorithms, such as the automated use of Node.js fibers at runtime, automated client/server and server/database dialog.
phy_si_kal writes: Today, a secretive startup from Paris, France has announced that it will open source the Opa technology it has been developing for some time. Opa is a one-tier web technology (right, that means only one layer at runtime) where Opa source code is compiled into a standalone binary. And, this could be really a game changer in the cloud era as it handles distribution very easily. Sadly, the code is not yet available but a 171-page manual and tutorial is already available (registration required) and packages seem on the wild. Disclaimer: I am at MLstate (and very happy)