curl-loader

curl-loader (also known as “omes-nik” and “davilka”) is an open source tool written in C that simulates the load and behaviour of thousands to tens of thousands of HTTP/HTTPS and FTP/FTPS clients, each with its own source IP address. It uses libcurl and supports authentication, login and logoff scenarios.

curl-loader is distributed under the GNU GPL v2 on SourceForge; the latest version is 0.56 and the last update dates from 2013.