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Janitr will welcome new users in your Slack team by sending them the welcoming message you've set either publicly or in DM. Introduce your team, send them your team's policies or simply say hello.
Cloudarina is a digital signage platform. It allows managing content remotely in a centralized manner. There is a web dashboard from where you add content, create a playlist and assign them to different screens that you have already registered.
A bot that keeps Trello cards in sync.
There's also https://teams.cardsync.xyz/, a version that works as a Trello Power-Up. It is tied to Trello teams (so all team members can use) instead of to a single Trello user -- it also uses custom bots per team instead of a single global bot.