It's not super popular in the US and not even our favorite messaging app, but you can't ignore the 800-pound messaging gorilla that is WhatsApp—since it was purchased by Facebook for almost $20 billion and it has over a billion users worldwide. It offers end-to-end encryption, has animated GIF support, group chat for up to 256 people, document sharing, voice and video calls, one-tap voice messages, and a Web-based interface you access by scanning a QR code with the app on your mobile device. It recently added macOS and Windows desktop versions.
One of the most popular synchronization services ever: simply put files in your Dropbox folder on the desktop, they get uploaded to the cloud, and are instantly synchronized with any other PC on the account. Files are also accessible via apps or the Web. If you delete a file by accident, you can use the site to get it back. You get 2GB of free online storage, which you can bolster by sharing on social media and downloading the mobile apps.
^ Jump up to: a b c Shea, Tom (1983-06-23). "Free software - Free software is a junkyard of software spare parts". InfoWorld. Retrieved 2016-02-10. "In contrast to commercial software is a large and growing body of free software that exists in the public domain. Public-domain software is written by microcomputer hobbyists (also known as "hackers") many of whom are professional programmers in their work life. [...] Since everybody has access to source code, many routines have not only been used but dramatically improved by other programmers."

Free Autodesk software and/or cloud-based services are subject to acceptance of and compliance with the terms of use or other applicable terms that accompany such software or cloud-based services. Software and cloud-based services subject to an Educational license may be used solely for Educational Purposes and shall not be used for commercial, professional or any other for-profit purposes.
At first glance, this looks like Dropbox or OneDrive, but Resilio Sync (formerly BitTorrent Sync) skips one aspect—it syncs file between computers without the files ever hitting a server on the Internet for online storage. This is purely peer-to-peer syncing, and works great with large files. For free, you get syncing between two devices but with unlimited data.

As the name implies, PowToon concentrates on providing a method for animating presentations. The free version is limited to 100MB of online storage and you only get basic image resolution and five minutes per presentation, with limited access to royalty free music and styles. But that should be enough to get you started and a limitation worth working with to make a great presentation.

The fastest way to create a PDF file is to make it in something you're comfortable with, be it a word processor or otherwise, then print the file out as a PDF. PDFCreator sets itself up as a printer on your system, so when you go to make a "print," you select it and out shoots a PDF to your PC. PDFs with this free tool can be secured, signed, and are automatically saved. The creators at PDFForge promise it will be free forever.
This is the original call to the community to start using the term ‘open source‘ that I issued on 8 February 1998. The event referred to in the first paragraph is the 23 January announcement of the Mozilla source code release. Because this is a historic document, I have fixed some link drift but haven't re-styled it to match the rest of my site. Though it has been converted to XHTML rather than HTML classic, except for this gray box and the RCS date at the bottom it looks pretty much exactly as it did then. There are Spanish and Indonesian translations of this document.
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