http://www.freenas.org/download-freenas-release/
File sharing is what FreeNAS does best. Every major operating system and hypervisor is supported. File sharing protocols include SMB (Windows file shares), NFS (Unix file shares) and AFP (Apple File Shares). FreeNAS Corral also has FTP, iSCSI (block sharing), WebDAV. iSCSI also supports VMware VAAI/Block, Microsoft ODX and Microsoft CSV.
Most operating systems, including Windows, Mac OS X, GNU/Linux, FreeBSD, and TrueOS can connect using SMB shares with little or no additional configuration needed on the client side. AFP is primarily used by Mac OS X and is well suited for a network environment that only connects with Macintosh clients. FreeNAS also supports Time Machine backups.