Spike is described as 'Transform your inbox into a collaborative workspace with integrated chat-like emails, cross-platform compatibility, and robust task management features' and is a Email Client in the office & productivity category. There are more than 50 alternatives to Spike for a variety of platforms, including iPhone, Windows, Android, Mac and Web-based apps. The best Spike alternative is Zulip. It's not free, so if you're looking for a free alternative, you could try Zulip or Spark Mail. Other great apps like Spike are Zoho Mail, eM Client, Delta Chat and Apple Mail.
Mac IMAP email client featuring keyboard control, Markdown email composition, advanced search capabilities, smart mailboxes, automatic signature handling, cryptographic options with OpenPGP/S-MIME, tagging, multiple notifications, and customizable layouts including widescreen.
myMail is the smart email app for managing all your accounts on iOS and Android.
Opensource email which cares about your privacy. Developed and hosted in France.
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.
LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.
Experience seamless communication with Xylo AI email assistant, the ultimate tool powered by cutting-edge Generative AI and Social Psychology.
TimelinesAI aggregates the messages from your e-mail and instant messengers (such as whatsapp) into one place.
Unibox is a people centric email client that organizes your messages by person. It avoids having email like a to-do list.
The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
Navigate messages with zooms and swipes across your messages.
Turn your email into colorful, visual tiles you can explore with your fingers or mouse. Rich 3D visualizations and familiar gestures make TouchMail the fastest and easiest way to keep your inbox clean and keep import.
Codermails is online email maketing provider. It is founded in 2017. It own best in class email marketing software for bulk email marketing service.
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Unibox is one of the very few chat-style email clients in existence. The others (that I know of) are Spike, DeltaChat (recommended) and arguably Mailspring.