Seems like there is a flood of new machines being produced.
I thought I would start a list of the ones I know of.
If I missed any, let me know.

- Stern: http://www.sternpinball.com
- Jersey Jack: http://www.jerseyjackpinball.com
- Retro Pinball: http://www.retropinball.net
- John Popadiuk: http://www.pinballinventor.org
- Skit-B: http://www.skitbpinball.com
- Quetzal Pinball: http://www.quetzalpinball.com
- Marsaplay: http://www.marsaplay.com
- Whizbang: http://whizbangpinball.blogspot.com
- Tilt Warning Customs: http://www.tiltwarning.com
- Heighway Pinball: http://www.heighwaypinball.com/
- Deeproot
- Suncoast
- Multimorphic http://www.multimorphic.com/
- Dutch Pinball http://www.dutchpinball.com/
- Riot Pinball http://riotpinball.com/
- Spooky Pinball http://www.spookypinball.com/
- Homepin http://www.homepin.com/abouttag.html
- Silver Castle http://www.silvercastlepinball.com/
- Pavlov - Kill Bill - http://pavlovpinball.com/
- Team Pinball https://teampinball.com/
- Pedretti Gaming (Italy)
- Pinball Brothers https://www.pinballbrothers.com/
- Chicago Gaming https://www.chicago-gaming.com/
- Pinball Adventures https://www.pinballadventures.com/
- Scandinavian Pinball https://scandinavianpinball.com/
- Bitronic https://bitronic.es/

New Pinball Tech.
- Pinball Controllers https://www.pinballcontrollers.com
- Multimorphic http://www.multimorphic.com/
- Fast Pinball https://fastpinball.com/

Added 2 more
Didn't know about marsaplay and forgot whizbang

added http://tiltwarning.com/ to the list

added http://www.heighwaypinball.com/

edited to add: http://www.multimorphic.com/

added
Riot Pinball http://riotpinball.com/
Dutch Pinball http://www.thebiglebowskipinball.com/
Spooky Pinball http://www.spookypinball.com/

added homepin http://www.homepin.com/abouttag.html

silver castle http://www.silvercastlepinball.com/

added http://pavlovpinball.com/exclusive-sneak-peak-at-kill-bill-pinball/