Slack, Microsoft Teams, Rocket.Chat, Skype, Mattermost, Pidgin, Matrix.org, HexChat, SeaMonkey, I-N-V-I-S-I-O-N, irc.lc, Ripcord, lightIRC, Mibbit, WeeChat, irssi, Chatzilla, Chat Anywhere, Linkinus, Polaris SE, cabal, ClicksAndWhistles, HydraIRC, ChatButton, MIRGGI are some alternatives to ZeroChat.