The best replacement for corosync is heartbeat.

The best alternatives to corosync are rated as following:
★★★★★  heartbeat
★★★  pacemaker
★★  cman
★★  openais

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

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



Google Trends

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corosync
heartbeat
pacemaker