Reach those pesky AFKers, alt-tabbers, chat-ignorers and offline people with one simple trick!

Pingspam allows you to mention players in chat. You can mention by name (i.e "@GreatGrayOwl") or group.

The ping is highlighted in chat, plays a sound for the player, and hogs the actionbar until dismissed.
It will also persist between relogins - until you acknowledge it using the /notifications command.

Pingspam works with vanilla clients.
You don't need to have Pingspam to (suffer from) enjoy advanced attention-grabbing techniques. However, installing it on the client adds chat autocompletion for @mentions.

Groups and aliases

You can have a shorter or a more descriptive name for others to ping you by. /pingspam alias [add|remove] alias adds or removes aliases, and /pingspam alias list lists them.

You can have up to 10 ping aliases in addition to your own player name. Aliases are first come, first served.

Operators can also assign players to groups, so that you can ping all the @redstoners at once.

/pingspam group list lists all groups you are a member of.

Ignore

You can ignore direct pings from particularly annoying players using /pingspam ignore add offender
You can use /pingspam ignore list to review your ignore list and /pingspam ignore remove offender to stop ignoring them.

Sounds

You can change the notification sound that you hear by using /pingspam sound (minecraft sound id)
You can disable the ping sound altogether by using /pingspam sound none

The default sound is /pingspam sound minecraft:block.bell.use