GtkHx is a GTK+ Hotline Client originally based on Hx.

Features

• Modern GTK+ 4 / libadwaita / libpanel UI with retro look and feel
• Full TLS support, for servers, file transfers, and trackers
• Voice chat (beta)
• Inline media (in progress)
• Tracker v3 support
• HOPE ChaCha20-Poly1305 cipher support
• Support for native UTF-8, large file transfers, chat history, and colored names on servers that support them
• File preview supports common image types, QuickDraw PICTs, PDFs, and markdown / source files
• Orthogonal file manager interface for file transfers
• Server banner support
• Systray and app notifications
• Supports light and dark themes

History

GtkHx was originally created in 2000, with work on it ceasing in 2003. In 2026, the original author, Misha Nasledov, resurrected GtkHx as a modern application with the latest Hotline protocol extensions.