HelpStack - Open Source mobile help framework to support iOS and Android app users.
indemandly - Live chat 2.0: Customer messaging that converts
KeyReply - Omnichannel keyboard for mobile teams to respond better and faster.
Message Me - Website to create your contact business card
Helpshift - Helpshift is an in-game customer support platform that enables mobile apps to improve customer experience, drive higher ratings and increase retention.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.