The best replacement for stunnel is ssh.

The best alternatives to stunnel are rated as following:
★★★★★  ssh
★★★  stud
★  ssh tunnel

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

Other search terms related to stunnel and their ratings are:
★★★★★ haproxy
★★★★★ netcat
★★★ quickfix
★★ openssl
★ xnews
osiris
You have in mind a companion for stunnel and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of stunnel in all years. Click on graph for more.
stunnel
ssh
stud