Like, stunnel: https://www.stunnel.org/index.html and how to setup (Re: MySQL over stunnel) http://linuxgazette.net/107/odonovan.html
upd.: don't get me wrong, Redis is my favorite DB, really. But better to be objective.
Implementing SSL is easy. Implementing SSL correctly is very difficult, and you probably won't find out you did it wrong for a long time, if ever.
I'm happy that redis doesn't implement SSL, it just shows that they are prioritizing relevant features.
Also solutions like stunnel create a separate process that has to be managed. If I have one for redis, and then one for something else it is harder to tell them apart, because both will be named stunnel.