There are 2 repositories under bitcoinrpc topic.
Blockchain Wallet API Service
Bitcoin/Altcoins PHP Payment Class. It supports Bitcoin BitcoinCash DASH Dogecoin Litecoin Reddcoin Feathercoin Vertcoin Potcoin Speedcoin. Install GoUrl php script - bitcoin api payment gateway on your site!
Bitcoin JSON-RPC Service Provider for Laravel.
Bitcoin components for JVM & Android (JSON client & server support, services, DSL, CLI)
Java client to connect to the bitcoin core with jsonrpc