21. Ping.eu
This is the tracking tool that helps the user know the time the data packets have taken to reach the host. This is an online application where you simply place the hostname or IP address and retrieve the result.
22. Dig
It is a complete system of search and indexing used for a domain or Internet. Works on Linux and Windows systems. However, it does not replace Internet search systems like Google, Infoseek, AltaVista, and Lycos.
23. CURL
It is an open-source and free software command-line tool that transfers data with the syntax of the URL. It supports HTTP / HTTPS, Gopher, FTP, LDAP, POP3, and many others. It can run under a wide variety of operating systems. The recent stable version is v7.37.1.
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Encryption Tools
24. TrueCrypt
TrueCrypt is an open-source encryption tool that can encrypt a partition in the Windows environment (except Windows 8); is equipped to create a virtual encrypted disk in a file.
Also, it can encrypt the entire storage device. TrueCrypt can run on different operating systems, such as Linux, Microsoft Windows, and OSX. TrueCrypt stores the encryption keys in the computer’s RAM.
25. OpenSSH
OpenSSH is the abbreviated name of Open Secure Shell and is a free software suite used to protect your network connections. It uses the SSH protocol to provide encrypted communication sessions on a computer network.
It was originally designed as an alternative to Secure Shell software developed by SSH Communications Security. The tool was designed as part of the OpenBSD project.
26. putty
It is an open-source encryption tool available on UNIX and Windows operating systems. It is a free implementation of SSH (Secure Shell) and Telnet for Windows and UNIX. The beauty of this tool is that it supports many network protocols such as telnet, SCP, rlogin, SSH and plain socket connection. The word PuTTY has no special meaning, but as in the UNIX tradition, tty is a terminal name.
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27. OpenSSL
OpenSSL is an open-source encryption tool that implements TLS and SSL protocols. The main OpenSSL library is written in the C programming language. The basic cryptographic functions are implemented by it. OpenSSL versions are available for operating systems such as UNIX, Solaris, Linux, and Mac OS X. The project began in 1988 to invent free encryption tools for programs used on the Internet.
28. Tor
Tor is a free encryption tool and can provide online anonymity as well as resistance to censorship. The internal traffic is executed by a free network that consists of more than five thousand relays so that the reallocation of the user can be hidden. It is difficult to follow Internet activities, such as visiting websites and instant messages; the most important objective of this tool is to guarantee the privacy of users.
29. OpenVPN
It is an open-source tool for deploying virtual private network techniques so that secure site-to-site or point-to-point connections are possible through routers or bridges. Remote access is also possible. OpenVPN offers users a secure authentication process using pre-shared secret keys.
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30. stunnel
Stunnel is an open-source cross-platform tool that is used to ensure that clients and servers get secure encrypted connections. This encryption software can run on various operating system platforms such as Windows and on all operating systems that are UNIX. Stunnel relies on a separate library as SSLeay or OpenSSL to implement protocols (SSL or TLS)
