The best Instant Messenger alternative to Spike is Delta Chat, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Spike and four of them are Instant Messengers so hopefully you can find a suitable replacement. Other interesting Instant Messenger alternatives to Spike are Zulip, BlackBerry Hub and RelayBeam.
Provides a chat experience over email, with all messages and contacts stored on user devices, open source code, group media support, and compatibility with any provider. No central servers, no tracking, works without SIM, and can be used by anyone just via email.
Threaded group conversations combine live and asynchronous messaging, separating topics for organized collaboration, supporting open-source, cloud, and self-hosted deployments, secure communication with encryption, and multi-platform access for diverse teams.
BlackBerry Hub+ Inbox is a consolidated app for emails, calendar events, and social notifications from platforms like Facebook, WeChat, Twitter, LinkedIn, WhatsApp, and more. It is compatible with Android Wear and not just limited to BlackBerry devices.
RelayBeam is a messaging platform with an innovative multi-port feature for enhanced communication.
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The best FOSS alternative to any other chat-styled email clients. I've been hooked ever since I downloaded this application!