Are most Erlang applications such as MochiWeb, Riak, RabbitMQ, Zotonic, ejabberd and CouchDB OTP applications?

CouchDB had lot of problems with that but the newest sources published by Cloudant show CouchDB in rebar, so it must be otp compliant.

The Hibari database app is definitely OTP-based. The server is broken into several OTP apps, including a small one for managing config and logging (gmt), a big one for the server itself (gdss), a small one for native Erlang clients (gdss_client), and separate OTP apps for each of the server-side protocol handlers (e.g. JSON-RPC, UBF, EBF/BERT).

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