GNS3 is a Graphical Network Simulator. The tool operates on popular desktop platforms such as Windows, Linux, Mac OS X. It is designed for creation of different topologies on a computer network.
F-Secure SSH Client is a free software product for secure transmitting files. It supports multiple profiles of users. F-Secure SSH Client simplifies exchanging documents with remote Linux servers. With this tool one doesn’t have to install any additional application.