OpenMQ, ActiveMQ or RabbitMQ

I am trying to form a proper proposal for my project however I do not know exactly what I can do. I was thinking whether I could work on a client side library which enables that client to connect to a known broker such as OpenMQ or ActiveMQ. Have you got any ideas which may be the best client, example c#, I can use to connect to a known broker? It seems I can't find enough information on my own so any replies are much appreciated, thanks in advance

On a side note, does anyone know for which languages Spring Integration does not exist?