The wso2 esb free support is mainly here in stackoverflow, they have also payed support though for the price you'll have to contact them (I think prices vary depending on the type of support you need).
I have not used wso2 but can definitely speak about fuse. I have been using different integration capabilities of fuse. Foremost thing is, it is osgi based, it is definitely a thing to consider if you are architecting a new solution. I find fuse community very active. Best thing about fuse is it is provides integration capabilities for aws, hdfs and hbase besides jms, rest, http(s) proxy end points, load balancers etc
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