Bukkit/Spigot

Download TAB and TAB-Additions, then put them both in your server's plugins folder. Launch your server and you can start looking at those new config files!

BungeeCord

Same thing, download TAB and TAB-Additions, put them both in your proxy's plugins folder and restart your proxy.
Note: Some features are not available in the BungeeCord version:

• Hide Nametags On Sneak
• Nametag In Range
• Tablist Names Radius