Pusher has established itself as a leading service for delivering WebSocket messages to connected clients via its simple, RESTful Pusher API. This especially suits application developers working with languages and platforms that struggle to maintain and scale persistent connections. We remove the need to roll a custom solution and work with complex and unfamiliar technologies, and ensure the benefits of a hosted service can be achieved. We've recently added support for WebHooks, which provide a different sort of real-time solution.
Parse, a leading backend-as-a-Service mobile SDK provider, has launched a new service called Cloud Code making it possible for app developers to add custom backend code that is easily accessible by any client (iOS, Android, HTML5, or via the REST API) without servers.