Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
From the Website:
The first release of the advanced RAT Flux. It allows administration of remote computers, including the ones behind routers or protected by firewalls. Small server size (22 kb) without cutting down on features. Features such as streaming of desktop/webcam, persistant server, 1024-bit encrypted connections, filedownloads supporting resume, keylogger, passwordsniffer, SOCKS4 plus a lot more. Flux also introduces a whole new concept of user organisation, screen capturing methods and streaming of multiple users desktop/webcam to thumbnails.