The best replacement for alsa is oss.

The best alternatives to alsa are rated as following:
★★★★★  oss
★★★★  jack
★★★★  pulseaudio
★★  oss4
★★  asio
★★  pulse
★★  pulseaudio arch
★  tinyalsa
★  gstreamer
★  pulseaudio ubuntu
★  oss ubuntu
★  pulse ubuntu
★  coreaudio
  esd
  pulseaudio ubuntu 12.04
  pulseaudio debian
  pulse audio
  wasapi
  oss linux
  oss audio
  house of kolor

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

Other search terms related to alsa and their ratings are:
★★★★★ pulseaudio
★★★ oss
★ multiple sound cards
You have in mind a companion for alsa and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of alsa in all years. Click on graph for more.
alsa
oss
jack