The best replacement for statsd is collectd.

The best alternatives to statsd are rated as following:
★★★★★  collectd
★★★★  riemann
★★★  logstash
★★★  metrics
★★★  ganglia
★★  sensu
★  munin
  statsite

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

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



Google Trends

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statsd
collectd
riemann