Packet Tracer is an essential learning tool used in these Cisco Networking Academy courses: IT Essentials, CCNA Routing and Switching, CCNA Security, Intro to Internet of Things (IoT), and Mobility Fundamentals.
Cisco Packet Tracer mobile is a freely available network emulation stack centered around Cisco routers, firewalls, and switches. The mobile version is freely available without restrictions, while the desktop version is restricted to current students.
RANCID - Really Awesome New Cisco confIg Differ. A web-based tool for automatically downloading Cisco configurations into a CVS version-control system which can be searched, displayed and "diffed" to compare versions of the configuration files.
A VPN client compatible with Cisco AnyConnect VPN Client (now Cisco AnyConnect Secure Mobility Solution) and an open source substitute for Cisco's official Linux client.
OpenConnect VPN graphical client is a VPN client for Windows that provides security and privacy with seamless usability. Connect to any enterprise VPN environments under a simple and consistent interface.
The new EVE-NG platform is ready for todays requirements. It allows enterprises, e-learning providers/centres, individuals and group collaborators to create virtual proof of concepts, solutions and training environments.