These paper models are the Salamanders and Word Bearers Dreadnoughts, based on the game Warhammer 40K, the papercraft was created by Patoroch. There are other Dreadnought paper models at the site:
Warhammer 40K – Dreadnought Mk I Free Paper Models
Warhammer 40K – Chaos Dreadnought Walker Free Paper Models
Warhammer 40K – Mk IV Furioso Dreadnought Free Paper Model
Warhammer 40K – Ultramarines Dreadnought Mk. V
Warhammer 40K – World Eaters and Blood Angels Dreadnoughts
Warhammer 40K – Chapter Dreadnought Free Paper Models Part 1
Warhammer 40K – Chapter Dreadnought Free Paper Models Part2
Warhammer 40K – Dark Angels and Alpha Legion Dreadnoughts
Warhammer 40K – Dreadnought III Free Paper Model
Warhammer 40K – Imperial Fists and Death Guard Dreadnoughts
Warhammer 40K – Iron Hands and Iron Warriors Dreadnoughts
Warhammer 40K – Raven Guard and Emperor’s Shields Dreadnoughts
The Salamanders are one of the Loyalist First Founding Chapters of Space Marines. They originally served as the Imperium's XVIII Space Marine Legion during the Great Crusade and the Horus Heresy. Their homeworld is the volcanic Death World of Nocturne. The Salamanders as a Chapter are unusually concerned with civilian casualties compared to most other Space Marines and believe that one of their most important duties is to protect the lives of the Emperor of Mankind's innocent subjects whenever and wherever possible.
This is an attitude that developed as a consequence of the Salamanders' own unusually close connections to the Nocturnean people, as they are one of the only Chapters of Astartes who continue to interact with their families and the people of their homeworld after their transformation into Space Marines. For instance, it is not uncommon for a Salamander to serve as a clan leader among the Nocturneans and live with them when Chapter business does not require him to remain at the Chapter's fortress-monastery on Nocturne's moon of Prometheus. The Salamanders and their people as a whole are also defined by their adherence to a variation of the Imperial Cult called the Promethean Cult.
The Word Bearers are one of the nine First Founding Space Marine Legions that betrayed the Emperor of Mankind during the Horus Heresy. They became Chaos Space Marines, their allegiance pledged to their Daemon Primarch Lorgar and to Chaos Undivided. The Word Bearers were also the first Space Marine Legion to be corrupted by the Ruinous Powers of Chaos many decades before their counterparts turned to the Dark Gods and through their actions they corrupted the Warmaster Horus and brought on the terrible civil war of the Horus Heresy in all its savagery.
Today they bend all their considerable efforts towards the overthrow of the "Corpse Emperor" in the Long War and spreading the "truth" of Chaos to all Mankind. The Word Bearers Legion was originally known as the Imperial Heralds Legion when it was first raised on Terra and took part in the Great Crusade; after the Legion was reunited with its lost Primarch Lorgar on his homeworld of Colchis he renamed the XVII Legion the Word Bearers, which was in line with his belief that the Emperor of Mankind was the divine saviour of humanity. The Word Bearers' greatest foes amongst the servants of the Emperor are the Ultramarines and their Successor Chapters, who the Word Bearers have hated and seen as rivals since the time of the Great Crusade. [Source: wikia]
You can download the paper craft model here: Warhammer 40K - Salamanders and Word Bearers Dreadnoughts [Box] [Gavitex]