GM Code or GMcode stands for GreyMatter code. It provides style formatting without HTML tags.
Category: "2.x & above"
This skin tag displays a list of who is online.
All logged in users and guest users who have requested a page in the last 5 minutes are listed.
Ping the b2evolution.net site after your posts
This skin tag displays a navigable calendar.
Days containing posts are highlighted.
The Ping-O-Matic plugin pings http://pingomatic.com/, from where your ping gets relayed to a set of most common ping services.