Every year it gets a little easier to find alternatives, many of which are free and open source on all platforms.
For example, GIMP does most of what Photoshop does, RawTherapee is a great photo raw file editor with workflow similar to Phase One Capture One. Libre Office does most of what Microsoft Office does, and is file format compatible. TurboPrint makes inkjet printer drivers that are better than what the manufacturers provide on Windows & MacOS. VueScan makes one of the best photo scanner apps, JAlbum for creating online photo albums, Audacity for full featured audio file editing, REW for audio measurement, Zoom has a native Linux client, Thunderbird for email, Evernote has a native Linux client, Etc.