Is OpenWRT safe to use? The latest release, at least according to https://openwrt.org , was in April 2013. I'm not intimately familiar with what software packages it uses, but it seems like it could, at the very least, be vulnerable to Heartbleed.
If anybody wishes to contribute to OpenWRT, this talk from 30c3 should give you a good overview on the "current" state of the project (hint: apart from system programmers, web developers are also very much welcome/needed):