I built my own Microsoft 365 with free open-source apps and my productivity didn’t drop a bit

Published Sep 12, 2026, 6:30 AM EDT Parth, a seasoned tech writer, wields the keyboard (or pen) with finesse to unravel the intricacies of both Windows and Mac operating systems. He has covered evergreen content on mobile devices and computers for multiple publications over the last six years. You can find his work on AndroidPolice, GuidingTech and TechWiser. Whether it’s demystifying system updates, deciphering error codes, or exploring hidden features, Parth’s prose guides readers through the binary maze. When not immersed in tech jargon, you’ll find him sipping chai, pondering the next software review, and occasionally indulging in a friendly debate about mechanical keyboards. I always assumed Microsoft 365 was one of those subscriptions I simply had to keep. My work depends on documents, spreadsheets, notes, cloud storage, and a bunch of small productivity tools, so replacing the entire suite sounded more annoying than useful. Still, I wanted to see how far free open-source software has come. I swapped Microsoft’s apps for open-source alternatives and rebuilt my daily workflow from scratch. The surprising part wasn’t that the apps worked. It was how little I missed Microsoft 365 once everything was set up. ONLYOFFICE It feels instantly familiar to me Out of all the open-source Office alternatives I have tried, ONLYOFFICE comes the closest to giving me the Microsoft Office experience without Microsoft Office. The biggest reason is its familiar ribbon-style, tabbed interface. And unlike LibreOffice, it actually looks modern and up to date. I don’t have to relearn where basic formatting tools, tables, charts, comments, or presentation options are hiding. ONLYOFFICE also uses DOCX, XLSX, and PPTX as native formats, which is a huge advantage when most of the files I exchange are still Microsoft Office documents. For writing, it covers practically everything I need from Word. I can format long articles, insert tables and images, take advantage of templates, and review changes as before. If I am putting together an article draft to share with someone who uses Word, I can simply save it as a DOCX instead of worrying about conversions. The spreadsheet editor has been equally useful. It supports more than 400 functions and formulas, along with charts, named ranges, templates, and macros. I can use it for something simple like tracking monthly expenses or build a more detailed sheet for article assignments and deadlines. I can’t wait for the ONLYOFFICE version 10.0, which is just right around the corner. The company is promising major revamps for all the major apps, new AI features, bug fixes, and more. OnlyOffice ONLYOFFICE is an open-source alternative to Microsoft Office. Notesnook It finally pulled me from OneNote OneNote has been my default note-taking app for a long time, mainly because it works everywhere and gives me plenty of room to organize information. But Notesnook surprised me enough that I eventually replaced OneNote with it in this setup. The free plan gives me unlimited note syncing across devices and up to 50 notebooks. That is more than enough for my workflow. I also like how flexible the organization is. Notes can live inside multiple notebooks, notebooks can be nested, and I can use tags and colors to keep a large library manageable. Notesnook also supports reminders. When I am researching an article, I can create one note for links, another for observations, and keep everything under the same project notebook. The web clipper is useful too. Privacy is another major advantage. Notesnook encrypts my notes on the device before they are synced, so its servers only receive encrypted data. OneNote is still the more powerful app in some areas (especially in drawing tools), but I realized I wasn’t using more of that power. For writing, research, quick ideas, and organizing my daily information, Notesnook gives me everything I need. Notesnook Notesnook is a note-taking app that supports encryption. Nextcloud It became my private OneDrive OneDrive is one of the harder Microsoft 365 services to replace because it quietly sits behind so much of my workflow. My documents, screenshots, project files, and random folders are always available across devices without me thinking about it. Nextcloud is the open-source alternative that has come closest to giving me that same convenience, with one major difference: I have far more control over where my data actually lives. Once I set up the Nextcloud desktop client on my computer, it started feeling similar to OneDrive. I can choose which folders I want to sync, drop files into them, and Nextcloud automatically keeps the latest versions available across my connected devices. Nextcloud offers an excellent web interface with customizable widgets. Aside from being a OneDrive alternative, you can even expand the functionality with tasks, project management, and other tools. The company’s Android app is excellent, too. It supports Material You design, auto-upload camera, and other goodies. Of course, Nextcloud takes more effort to set up than simply signing into OneDrive. But once it is running, I barely think about it. My files stay synced, I can reach them from anywhere, and I am no longer dependent on Microsoft’s cloud. Nextcloud OS Windows, macOS, Linux Key highlights Self-hosted, open source Nextcloud is a self-hosting alternative to OneDrive and Google Drive. iOS compatible Yes Android compatible Yes Desktop compatible Yes My zero-cost Microsoft 365 alternative After using this setup, I am no longer convinced I need Microsoft 365 for my everyday workflow. ONLYOFFICE takes care of documents and spreadsheets, Nextcloud handles my files and syncing, and Notesnook gives me a clean place to organize everything I want to remember. The experience isn’t identical to Microsoft’s suite, and there are still a few rough edges, but none of them slowed me down enough to matter. That was the biggest surprise. I didn’t have to give up productivity just because I moved away from a paid ecosystem.