The best replacement for datapower is message broker.

The best alternatives to datapower are rated as following:
★★★★★  message broker
★★★★  layer 7
★★★  webmethods
★★★  webseal
★★  vordel
★  forum sentry
★  solace

Your alternative for datapower is not listed? Suggest!
Speaking about datapower, one probably shouldn't forget about mq.

Other search terms related to datapower and their ratings are:
★★★★★ mq
★★★★ saml
★★ wsrr
You have in mind a companion for datapower and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of datapower in all years. Click on graph for more.
datapower
message broker
layer 7