Crisp

Offers a business messaging platform for customer support, sales, and marketing.
Includes a "Mark as unread" feature for conversations.
Allows creating automated triage rules based on email addresses.
Displays conversation channels through icons.
Offers checkout extensibility for Shopify Plus merchants.
Allows separate enabling of file upload and audio recordings.
Provides a conditional bot block dedicated to message channels.
Includes a "Move to Inbox" action in the bot builder.
Offers an unofficial Linear integration for syncing Crisp with Linear.
Provides insights on email addresses set throughout a conversation.
Offers a total privacy mode for the chatbox (cookie-free).
Includes a dark mode option.
Allows creating product tours from the Crisp Workspace (via a 3rd-party app).
Offers the ability to generate Knowledge base articles from conversations (via a 3rd-party app).
Provides a free plan with 2 operators, unlimited visitors & messages, and mobile apps.