Slack, Microsoft Teams, Discord, Rocket.Chat, Facebook, Nextdoor, Skype, Kosmi, Zenchat, Diaspora, MeisterTask, Podio, Fleep, HumHub, ArrowChat, Neighbors by Ring, eXo Platform, Ripcord, Cell 411, Happeo, Jostle, tibbr, Just Social, everyme, ScoopLoop, Pacco are some alternatives to Whaller.