This addon was written by Viper and published on WoWUI by the user Ryiort (probably Viper acting under a different name). On WoWInterface, Viper gave permission for adoption of his addons. I tried contacting him for three weeks, through WoWUI, WowInterface, and the mail address on his website. Since he never replied, I did a hostile takeover on WoWUI and am now publishing Player Link Menu on other addon sites.

This add-on allows you to open up a menu when clicking on a players name in chat. This will give you some basic options, for fast and easy access. So no more having to write when wanting to invite a player you're talking to or if you want to ignore that player.

It also extends the options available when clicking on a name. You can choose what actions should be performed when doing a normal click or while holding down Shift, Ctrl or Alt. It is all configurable from inside the game. Type /plm to view the options screen.

This add-on was developed before Blizzard added the same functionality to the defaul UI. However using PLM gives you a few more options to customize the menu and click behaviours to your liking.