Software:

https://lemos.ai/

https://testfit.io/

https://www.kreo.net/

https://archistar.ai/

Single Family: 

https://bonestructure.ca/en/

https://buildcover.com/

https://www.plantprefab.com/ 

http://www.rocioromero.com/

https://methodhomes.net/ (Developing a commercial offering)

https://bensonwood.com/

http://www.marmol-radziner.com/

https://www.bluhomes.com/

https://www.sys.haus/

https://node.eco/

https://samara.com/ (Airbnb)

https://www.cover.build/

https://www.archiblox.com.au/

http://www.starckwithriko.com/

https://kisshouse.co.uk/

https://mekamodular.com/

http://batiprint3d.fr/en/

https://www.entekra.com/

http://www.acqbuilt.com/

https://hyggesupply.com/

https://www.modernempathy.com/

https://www.modulehousing.com/

https://www.mightybuildings.com/

Multi Family: 

https://blokable.com/

https://mitekmodular.com/

https://factoryos.com/

https://risemodular.com/

https://www.chapmantaylor.com/projects/umbrellahaus

https://www.skender.com/modular/

https://ichijousa.com/

https://www.guerdonmodularbuildings.com/

https://radurban.com/

https://www.boxabl.com/

https://www.modulous.com/

Hospitality:

https://kasita.com/

https://www.guerdonmodularbuildings.com/markets-served/modular-hotels/

https://www.guerdonmodularbuildings.com/

https://kaptureprefab.com/

https://www.skender.com/modular/ 

High Rise:

https://www.sustainablelivinginnovations.com/ 

http://polcomgroup.com/ 

https://assemblyosm.com/

Commercial:

https://www.koma-modular.cz/en

http://projectfrog.com/

Building Systems:

https://www.clarkpacific.com/

https://pacificwallsystems.com/ (Wood Walls)

https://kaptureprefab.com/

https://www.walltechinc.com/wall-panel-services/ (CFS)

www.bandtmfg.com (Bath Kits)

https://www.infinitystructures.com/ (CFS)

https://prescientco.com/ (CFS)

https://fabconprecast.com/product-systems/panels/ (Concrete)

https://www.kingspan.com/irl/en-ie/product-groups/structural-steel-solutions/steel-building-solutions/kingbuild-system ("SFS")

https://tewo.no/ (Norweigan - TEWO is a building system based on insulated solid wood elements. Fast mounting at competitive price.)

https://www.veev.com/

http://www.conxtech.com/

https://metricmodular.com/

Big Players:

https://www.sekisuihouse-global.com/#top

https://www.boklok.com/ (SKANSKA + IKEA)

Articles:

https://aecmag.com/technology-mainmenu-35/1806-embracing-digital-fabrication 

https://next-generation-living.com/sustainability/jerker-lessing-boklok/

https://www.businessinsider.com/chinese-skyscraper-built-in-19-days-with-modular-design-2015-6

Other Resources:

http://www.modular.org/

https://www.prefabreview.com/blog/directory-of-best-prefab-and-modular-home-companies-by-state

OTHERS FOR THE LIST?

Shoot over your favorites and we can keep building this list as a resource