WhatsApp, Telegram, Signal, Xabber, Zulip, Telegram X, Olvid, Vypress Chat, Winpopup LAN Messenger, Softros LAN messenger, ChatSecure, BigAnt Office LAN Messenger, Conversations, FluffyChat, RealPopup LAN chat, BORGChat, Squiggle, Network Assistant, Wibib are some alternatives to Bopup Messenger.