eM Client is a Windows based e-mail client for sending and receiving e-mails, managing calendars, contacts, and tasks.

FlashFXP is a proprietary FTP client with a simple Windows-based GUI.

Abyss Web Server is a compact web server available for Windows, Mac OS X, and Linux operating systems.

FileZilla is a free software, cross-platform FTP application, consisting of FileZilla Client and FileZilla Server.

mitmproxy is an interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.

Mongoose is an embedded web server.