ECBroadcaster is an easy to use broadcasting plugin. You can broadcast messages using /ecbc message or set up automatic messages. This plugin also has MOTD and Join messages, both support colours.
https://dev.bukkit.org/projects/ecsimplechat
Update (26/07/2022): Project is currently inactive, not sure if I'll update this project again, simplechat is more up to date(updated 2020) while this one has been sitting here since 2017, I recommend using simplechat instead of this one, I'll leave it up in case you still want to use it.

✓ Easy to use.
✓ Supports color codes.
✓ Add as many messages as you want.
✓ Broadcast by command.
✓ MOTD and Join message.
✓ Customizable Prefix.

/ecbc message
Broadcasts message to server. This also supports colours.
(Click THIS for colour codes. Use Chat Colour codes)
/ecbcrl
Reloads configuration. I don't recommend to use this but it works.
/ecbc message
Broadcasts message to server. This also supports colours.
(Click THIS for colour codes. Use Chat Colour codes)

# ECBroadcaster V6
# Check https://dev.bukkit.org/bukkit-plugins/ecbroadcaster/pages/guide-for-config for more information
# This is the delay between the messages. It is set to 100 seconds by default.
Interval: 100
# This is all your messages. You can add, remove or change the messages.
# COLOR CODES : https://www.spigotmc.org/attachments/example2-png.188806/
Broadcasts:
- '&aMessage 1'
- '&cMessage 2'
- '&bMessage 3'
- '&5Message 4'
ecbc:
# This is the message that comes up in chat when you join the server.
joinmessage: "&aThis is default join message! Change it in the configuration!"
# This is the server MOTD that you can see before you join the server.
motd: "&aDefault MOTD! Change it in configuration!"