AnyDesk is a free remote access program that allows the connection to a computer remotely, whether it is from the other end of the office or from the other side of the world.
FTP FileZilla (Free)
FileZilla is an FTP (File Transfer Protocol) client that allows you to transfer files between a local computer and a server on the Internet.
Firefox is now one of the most secure web browsers. Includes extreme anti-phishing and anti-malware measures. You can use it simultaneously with Internet Explorer or any other browser.
Mozilla thunderbird is a free mozilla email program, easy to set up and use. With possibility of agenda, and list of contacts.