Nagios it is also known as Nagios Core is an Open source and free to use computer application software. It initially released on March 1, 2002. It monitors systems, networks, and infrastructures. It also offers free monitoring and alerting services for servers. Switches, applications, and services. It also alerts users when things doesn’t go well. And alerts them a second time when the problem has been resolved. It was formerly designed to run under Linux. Nagios Network Analyzer tracks network traffic and bandwidth utilization. Nagios competitors include Zenoss, Zabbix, Microsoft System Center Operations Manager (SCOM) and SolarWinds, among other open source and commercial monitoring tools.
2. Packet Tracer
Packet Tracer is a cross-platform simulation networking tool designed by Cisco. It can run on multiple platforms like Windows, Linux, Android, IOS, and Mac. It allows users to create their network topologies and replicate modern computer networks. The packet tracer is very popular in networking students. The Packet Tracer allows users to mimic the configuration of Cisco routers and switches using a simulated CLI. It makes use of a drag and drop user interface, allowing users to add and remove simulated network devices as they want it. It is freely available on the internet you can download it from cisco official website you just have to sign in there to download it.
3. GNS 3
GNS 3 fully abbreviated as Graphical Network Simulator is a type of simulator of network software it was first released in 2008. It’s is by many large companies including Exxon, Walmart, AT&T and NASA, The development of GNS3 began in 2007 and it was a game-changer for networking industry from all over the world. It is very popular nowadays and mainly used by networking professionals. It is also used for testing networks before they put into the real world. Its main Competitor is cisco packet tracer.
Atera is simple and easy to use. It provides remote monitoring and management. It also supports multiple platforms that it can run on. It is a type of software designed to help IT administrators/Engineers remotely and proactively monitor client endpoints, networks, and computers. It also offers IT administrators/Engineers a range of features to stay on top of their network. The creators claim its cloud DNA and scalable SaaS packages make it extra fast for onboarding and rolling out in new organizations
5. Angry IP scanner
Angry IP scanner is an open-source, multi-threaded IP address and port scanner. It is similar to Nmap, and it has thousands of millions of users all over the world, Angry IP scanner
Has now become a standard tool for network administrators. It first rapidly pings, then checks port status, then starts resolving hostnames, gathering MAC addresses, OSs and whatever it can discern based on the data gathered. It can collect NetBIOS info like workgroup and domain names, as well as logged-in users if you happen to have privileged rights to retrieve this information. Like Nmap, it’s extensible with plugins. Scanning results can be saved to CSV, TXT, XML or IP-Port list files.