GM Code or GMcode stands for GreyMatter code. It provides style formatting without HTML tags.
Category: "3.x (incomplete list)"
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.
This skin tag displays a list of post archives.
Archives can be grouped monthly, daily, weekly or post by post.
Ping the b2evolution.net site after your posts
This skin tag displays a navigable calendar.
Days containing posts are highlighted.