mod_ratio is a file/byte ratio module for ProFTPD.
Features include per user/host/e-mail ratios, a
credit system with credit storage to flat text
database or an SQL database using mod_sql, and
custom leech and CWD messages.
Jetty is an Open Source HTTP Servlet Server written in Java. It is a full featured HTTP/1.1 server and a Servlet container. It is designed to be small, fast, embeddable and extensible. It supports HTTP/1.1, servlets 2.3, and JSP 1.2.