ONLYOFFICE Desktop Editors is free office suite for offline document editing and collaboration.
One pack - three editors - multiple features - Create, view, and edit text documents, spreadsheets, and presentations of any size and complexity. Deal with multiple files within one and the same window thanks to the tab-based user interface.
Compatibility with MS Office and OpenDocument formats - Work with most popular formats: DOC, DOCX, ODT, RTF, TXT, PDF, HTML, EPUB, XPS, DjVu, XLS, XLSX, ODS, CSV, PPT, PPTX, ODP.
Quick access to broad collaborating capabilities - Connect to servers and collaborate on documents with your team: co-edit in real time, review, comment, and interact using chat.
Third-party add-ons - Create templates, insert video from YouTube, and do even more. Extend ONLYOFFICE functionality with integrated add-ons or create your own one.
Updates and technical support - Free regular updates. Fast and professional assistance for all technical and functional issues via Forum
What's new in ONLYOFFICE Desktop Editors
Added Seafile provider connection options
Interface Themes support
Spellchecker implemented as SharedWorker. No more back-end service for spellchecker
Ability to add file to favorites (must be supported on DMS side)
Looks quite nice, but it tampered with my open document spreadsheets. Font was changed from Helvetica Neue to Calibre and column width was altered. Re-opening the roundtrip files resulted in very odd looking documents. I can thus not recommend this over LibreOffice.
This product seems free at a minimum cloud based configuration to registered non-profits who must also advertise the product to get it free. Otherwise the cloud based version for a single users is $48/year as a subscription or around ~$1000 or more for an unlimited downloadable version with a years support.
I found little remarkable about this suite when compared to purchasing the real Office for about the same amount for a single user license. Even less remarkable considering the free suites of Open Office and Libre Office. Even NeoOffice is only a $30 donation.
Save your money or buy the real thing - Microsoft Office 2016 for OS X.