Free Network Management Software
Metabase
Metabase is an open-source tool that allow data and analytics to be shared fast and easy within a company. The open-source business intelligence server provided by Metabase can be installed within 5 minutes. Metabase can also, easily be integrated with third-pary services and databases like Amazon Redshift, Druid, Google Analytics, Google BigQuery, H2, MongoDB, MySQL, Oracle, PostgreSQL, Presto, Snowflake, SparkSQL, SQL Server, SQLite and Vertica. The software is provided free and open-source under the GNU Affero General Public License (AGPL) and managed server solutions can be purchased at a monthly subscription.
Google Public DNS
The Domain Name System (DNS) protocol is an important part of the web's infrastructure it resolves the names of internet sites with their underlying IP addresses. Google Public DNS is a free, global DNS resolution service that anypne can use as an alternative to their current DNS provider.
SolveDNS
With SolveDNS you can check your name servers, A records, mail servers, SOA records for errors, consistency, accuracy and preform speed using several DNS tests. SolveDNS does not cache any test results, so you get a fresh report everytime you run the test for your domain names.
pwncat
pwncat is a sophisticated bind and reverse shell handler with many features as well as a drop-in replacement or compatible complement to netcat, ncat or socat. pwncat is like netcat on steroids with Firewall, IDS/IPS evasion, bind and reverse shell, self-injecting shell and forwarding magic - and its fully scriptable with Python (PSE)
PuTTY
PuTTY is a free and open-source lightweight and simple terminal application for Windows. PuTTY supports SSH client, telnet, SFTP, and rlogn and is useful for administrations that need to establish an SSH connection to remote systems such as network switches, routers, unix systems and vmware. PuTTY is provided as a 32 bit and 64 bit client with supports SSH2 and SSH1 protocols.
Grafana
As the world's most popular free and open source technology for visualizing metrics, Graphana makes it easy to create a interactive dashboard for data monitoring. Grafana's designed from the ground-up for analyzing and visualizing metrics such as system CPU, memory, disk and I/O utilization. All metrics provided by connected data sources and applications can be visualized and monitored though charts, graphs, and alerts. You can also extend the core functionality of Graphana through a built-in plug-in system. Popular companies and applications like Uber, Robinhood, Nubank and others trust Graphana and its real-time visualization and monitoring capabilities.
Netcat
With Netcat you can read and write data across network connections with the TCP/IP protocol. Netcat is a feature rich networking utility for macOS, Linux and Windows that is designed to a reliable tool that can be utilized by external programs and scripts. Netcat provides intricate tools for netowork debugging, network exploration and connection creation.
Wireshark
Wireshark is the world's most widely-used network protocol analyzer software. With Wireshark you can get a better understanding on what's happening on your network. The software let's you do deep analysis across hundreds of protocols at a microscopic level. Wireshark is free and open-source and has been in active development by contributions from volunteers across the globe since 1998. Today the software is used by commercial and non-profit enterprises, government agencies, and educational institutions.
Spyse
Spyse is a complete internet assets registry for cybersecurity professionals. With Spyse, you can track domains and their technology use to discover security vulnerabilities and technology choices. Spyse tracks over 25 billion records about the Internet-connected assets that can be browsed and downloaded.
MremoteNG
mRemoteNG is an open source, tabbed, multi-protocol, remote connections manager for Windows. The project was originally forked from the mRemote, and has been improved ever since. mRemoteNG allows you to view all of your remote connections in a simple yet powerful tabbed interface.