As of yesterday, linux_base-c7 landed in ports for installing the CentOS 7 base packages. This will allow running newer Linux binaries built for modern CentOS/RHEL 7 era systems on FreeBSD, assuming the source isn't available or isn't compatible natively with FreeBSD. Previously CentOS 6 was the default port used for this Linux binary compatibility with FreeBSD.
FreeBSD's binary compatibility layer is good enough for running Linux games but when trying earlier this year atop FreeBSD 11.0 development code it wasn't working as nicely... But now with this CentOS 7 port, I'll try to get around to running some new tests shortly for some FreeBSD vs. Linux gaming benchmarks.
More details on the emulators/linux_base-c7 addition can be found via FreshPorts.org.