It's a shame to see this plugin go to the weeds. There are some big challenges to see it grow in the coming years, and without any response from Frederick, I fear it will eventually become too obsolete to recover. Unfortunately, I don't know of any other tool that can cache in a multi-server setup (Batcache is just as ancient).

There are a few pressing issues that need to be addressed (blank screen bug, PHP7 compatibility). There are a bunch of fixes in the support forums, but they need to be added to the plugin.

W3TC was originally positioned as an advanced caching tool for big sites, but became the go-to for every little site, and the support load became unbearable.