iFTPd, Independent FTP Daemon, is an open source FTP server.
Edit by : iFTPd, Independent FTP Daemon, is an open source FTP server written in Java. iFTPd features platform iNdependence, system independence, ruggedness and a virtual file system. The Target audience of the FTP server is for those admins that need to be able to share files without having to install several other programs and databases and without having to configure the rest of the system.

Current features

* Platform independence (Where do you want your JVM to go today?)
* System independence
o Does not require any users / groups on the host system.
o Does not require an SQL database.
o Does not does have weird and wonderful dependencies that must be downloaded from 500 different places.
* Ruggedness
o Once started, only the admin can stop iFTPd
* Virtual file system
o Create virtual file links, virtual directory links
o Merge several directories into one virtual directory
o Completely transparent to the user
* Users and groups
o Users can be members of serveral groups
o Group files can contain other group files
* SSL/TLS command and data channel encryption
o AUTH TLS support
o Encryption is available on the command and data channels
o Encryption can be forced, locking out non-encrypted connections
* Firewall friendly
o Easily define which ports iFTPd runs on and which IP to report to clients
* Text file-based configuration
* Multithreading
* Telnet-based status monitor
* HTML status monitor
* Reload functionality
* ALLO support :) you can free download Independent FTP Daemon 1.5 now.