FileZilla is a free software, cross-platform FTP application, consisting of FileZilla Client and FileZilla Server. Developed by Tim Kosse
License: Open Source
Microsoft IIS is a powerful web server designed for Windows environments, providing extensive features for enterprise applications and security. In contrast, FileZilla Server is primarily an FTP server that is free and open-source, making it suitable for simpler file transfer needs but lacking the extensive capabilities of IIS.