The best replacement for haproxy is nginx.

The best alternatives to haproxy are rated as following:
★★★★★  nginx
★★★  f5
★★★  varnish
★★★  squid
★★★  elb
★  hipache
★  apache mod_proxy
★  apache proxy
★  mysql proxy
★  apache load balancer
★  lvs
★  keepalived
★  mod_proxy
  nginx reverse proxy
  amazon load balancer
  netscaler

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

Other search terms related to haproxy and their ratings are:
★★★★★ ssl
★★★★ nginx
★★★ stunnel
★★ keepalived
★★ mysql cluster
★ failover
You have in mind a companion for haproxy and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of haproxy in all years. Click on graph for more.
haproxy
nginx
f5