http://www.megalextoria.com/wordpress/index.php/2016/09/16/os2-warp-version-4/
This is the install screen for OS/2 Warp Version 4. OS/2 was a true multi-tasking operating system developed by IBM (though Microsoft was involved early on). OS/2 Version 2.1 was the version I tried on my 486. It was out well before Windows 95, could multi-task very well and could run DOS and Windows 3.1 software. Unfortunately it didn't have the best video card support and my early nVidia card could only do 640x480 in OS/2. Warp 3 was heavily advertised for a time and was a direct competitor to Windows 95.
It was a great operating system but unfortunately could never compete with Microsoft in terms of popularity and has long since been discontinued. Version 4 was the last major consumer oriented release.