Looking for VNC client solutions that work reliably on a Mac running OS X 10.9.5

I have a number of FreeBSD servers, and I'd like to put VNC server software on them, then access them from a Mac running OS X 10.9.5. I believe Apple had a built in client with a non-obvious name, perhaps "screen", which they "fixed" a few releases ago to only work if the VNC server was itself from Apple, running on a Mac. I once used "chicken of the vnc", which was flaky on older OS X release from 2 years ago. IIRC, I was using "Tightvnc" or "Realvnc" on my servers at that time, which had worked fine with the first random windows-based VNC client I tried. All I've heard about so far are - "screen sharing app" from apple, possibly pre-installed on the mac, name and location unknown - a client from realvnc that runs in the chrome browser (ugh!) I appreciate alternativeto.net as a source for finding software of this type. I now have tigervnc running on one server and on the Mac client. No flakiness so far, but the Mac client for tigervnc seems unwilling to let me connect to multiple servers at the same time, and Mac's GUI interface seems unwilling to let me launch multiple copies of the client program. So still looking for alternatives, but making progress. Still trying to figure out how to invoke the client built into OSX - it's not at the path I found on the net, /System/Library/CoreServices/Applications Looks like I need to know the right invocation to feed to Finder, which doesn't have anything like a button labelled 'screen sharing'. I did find a menu item labelled "connect to server", but that just gives me connection failures, perhaps because it's defaulting a URI type of afp:// which probably has nothing to do with vnc - or perhaps because the tool is unrelated to vnc.] What client software can do better than what I have or how do you set it up to solve my issues (cut/copy/paste functionality) as well as those listed above?