Skype is a telecommunications application that specializes in providing video chat and voice calls between computers, tablets, mobile devices, the Xbox One console, and smartwatches via the Internet. Skype also provides instant messaging services. Users may transmit text, video, audio and images.
An excellent diagramming tool that comes packaged with LibreOffice, letting you create flowcharts and other diagrams. It comes with a free Viso-like shapes package, too! LibreOffice Draw is a free and open-source vector graphics editor. It is one of the applications included in the LibreOffice office suite, developed by The Document Foundation. LibreOffice Draw can be used to create complicated figures using shape tools, straight and curved tools, polygon tools, among other features. Wikipedia
Calibre was designed to make managing your eBooks as easy as possible and does that job perfectly with its neat and clean features. Calibre is a cross-platform open-source suite of e-book software. Calibre supports organizing existing e-books into virtual libraries, displaying, editing, creating and converting e-books, as well as syncing e-books with a variety of e-readers. Editing books is supported for EPUB and AZW3 formats. Wikipedia
Cyberduck is a popular FTP client that helps you connect to your FTP server and upload and remove files to and from the server. Cyberduck is an open-source client for FTP and SFTP, WebDAV, and cloud storage, available for macOS and Windows licensed under the GPL. Cyberduck is written in Java and C# using the Cocoa user interface framework on macOS and Windows Forms on Windows.
Opera Mail for Windows PC. The software makes it really easy for you to read your emails, label them however you want, and also do filtering to get to the emails you actually want to read. Opera Mail is the email and news client developed by Opera Software. It was an integrated component within the Opera web browser from version 2 through 12. With the release of Opera 15 in 2013, Opera Mail became a separate product and is no longer bundled with Opera
Mozilla’s offering still rules the roost when it comes to desktop email clients, and recent updates have done a great job of modernising its interface to make it a bit more welcoming. Mozilla Thunderbird is a free and open-source cross-platform email client, news client, RSS, and chat client developed by the Mozilla Foundation. The project strategy was modeled after that of the Mozilla Firefox web browser.