Roster — your guild list with spec, item level and the public note we use to mark who an alt belongs to. Sort it, search it, filter to people who are online.
Raids — officers create them (date, difficulty, min ilvl if you want). There's a count of tanks / healers / DPS at the top. When a raid's done, an officer can mark it complete and it sits there in green for a while.
Hover — spec, ilvl, rank, last seen, and the note. If you've got Raider.IO installed you'll also see their raid progress and M+ score. You don't need Raider.IO for the rest of it.
Sync — happens in the background over the guild channel. Log in later and you catch up from whoever's on.
Syncing Guild Codes — Send a generated 6 digit code and put in the main officers character name & server to sync Raid Rosters between guilds.opens it.
/grr /grrg raids goes straight to raids. Minimap button works too.
Officers and the Guild Leader create / edit / delete raids and can pull people off a sign-up. Everyone else just signs themselves up.