“What is the opposite of Microsoft Office?”/“Megahard Onfire.”

Microsoft Office is a family of client software, server software, and services. A riddle was posted on Twitter by Kharos on April 22, 2019:
   
WHAT IS THE OPPOSITE OF MICROSOFT OFFICE?
MEGAHARD ONFIRE
 
The joke was posted on Reddit—4chan on April 23, 2019, where it appears that it was written by “Anonymous” on April 22nd at 11:24 a.m.
   
   
Wikipedia: Microsoft Office
Microsoft Office (or simply Office) is a family of client software, server software, and services developed by Microsoft. It was first announced by Bill Gates on August 1, 1988, at COMDEX in Las Vegas. Initially a marketing term for an office suite (bundled set of productivity applications), the first version of Office contained Microsoft Word, Microsoft Excel, and Microsoft PowerPoint. Over the years, Office applications have grown substantially closer with shared features such as a common spell checker, OLE data integration and Visual Basic for Applications scripting language. Microsoft also positions Office as a development platform for line-of-business software under the Office Business Applications brand. On July 10, 2012, Softpedia reported that Office is used by over a billion people worldwide.
       
Twitter
Kharos
@Khar0s
WHAT IS THE OPPOSITE OF MICROSOFT OFFICE?
MEGAHARD ONFIRE
4:20 PM - 22 Apr 2019
 
Reddit—4chan
Posted by u/HFClBrI April 23, 2019
Opposite of MicroSoft Office
(...)
WHAT IS THE OPPOSITE OF MICROSOFT OFFICE?
MEGAHARD ONFIRE
   
Twitter
Hendriech
@hendriech_
Opposite of MicroSoft Office via /#Reddit/4chan http://bit.ly/2UP73kz  #4chan
3:38 AM - 23 Apr 2019
 
Reddit—3amjokes
Posted by u/MurdererRapist April 23, 2019
What is the opposite of Microsoft Office
Megahard Onfire
   
Twitter
Double Lebrontondre
@Trilliam_Yeats
What is the opposite of Microsoft Office?
Megahard Onfire
10:19 PM - 23 Apr 2019 from Pleasant Hill, CA