(covers information from several alternate timelines)
This is a list of unnamed holograms, as created by different species and presumably different, yet similar technologies.
Borg
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Species-5618
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A male member of Species 5618
A Borg hologram of Species 5618, which was the designation given by the Borg for the Human species. (VOY: "Dark Frontier")
Federation
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Borg
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A holographic Borg
This Borg drone was part of Commander Reginald Barclay's class at Starfleet Academy in 2404. He made this hologram for his cadets when guest speaker Admiral Kathryn Janeway visited his class. (VOY: "Endgame")
Tarlac masseuse
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A holographic Tarlac
The Doctor took the form of this holographic Tarlac masseuse in 2376 when he tried to diagnose Doctor Lewis Zimmerman. (VOY: "Life Line")
See also
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Kradin
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Commandant
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The Kradin commandant
The Kradin commandant was a photometric projection in a training/recruiting simulation by the Vori Defense Contingent. In this simulation, the commandant and his soldiers attacked the Larhana settlement of the Vori and brought the ill and elderly people to the extermination facility. The commandant and two of his soldiers surprised Commander Chakotay, who witnessed this from outside the settlement.
In the settlement, the commandant ordered to bring Karya to the extermination facility, too because "the pretty one", how he named her, was loud and asked to spare her grandfather Penno. Chakotay attacked him before he was knocked out by one of the guards. (VOY: "Nemesis")
The photometric projection of the Krenim commandant was one of the violent thoughts, the Mari Guill extracted from Tuvok's mind in 2374. (VOY: "Random Thoughts")
Commandos
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These two photometric projections of Kradin commandos attacked Commander Chakotay and the Vori soldier Namon while the two were searching for the debris of Chakotay's shuttlecraft. Namon was killed but Chakotay was able to kill one of the Kradin. The second Kradin commando was then killed by Brone and his fourth Vori Defense Contingent. (VOY: "Nemesis")
Soldier
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A Kradin soldier
This photometric projection of a Kradin soldier addressed Chakotay by name after his Vori Defense Contingent was nullified. He told Chakotay that the whole situation was not real and that he would bring him back aboard the Voyager. In reality, this soldier was Tuvok, who accompanied a Kradin contingent to rescue Chakotay. During their talk, Chakotay saw Tuvok and the Kradin soldier disappeared. (VOY: "Nemesis")
Soldiers
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These photometric projections of Kradin soldiers attacked the Larhana settlement under the command of the Kradin commandant. They escorted the ill and elderly Vori to the extermination facility. One of them was attacked by Chakotay when he tried to stop the transport. Chakotay then also attacked the Kradinc ommandant but was knocked out by another soldier. (VOY: "Nemesis")

Chuck Borden behind the scenes
Minosians
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Peddler
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A holographic Minosian peddler
The Minosian peddler was an automated sales-pitchman for the Minosian Arms Industry of the planet Minos, who were noted for technologically advanced weaponry, an example of which was the Echo Papa 607. The salesman promised good deals and promised peace through superior firepower.
At first the USS Enterprise-D crew believed him to be real. They soon realized that it was a pre-recorded holographic message, and that the Minosian civilization had been wiped out by their own weapons. (TNG: "The Arsenal of Freedom")
Nuu'Bari
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Laborers
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These three Nuu'Bari holograms were primitive holograms employed as laborers aboard a Nuu'Bari mining vessel in 2377.
After Iden delivered them from the Nuu'Bari mining vessel he wanted them to join his rebellion, but the first hologram only asked for input. Iden was unhappy to learn that they were non-sentient holograms and had very low matrices that could not be enhanced. (VOY: "Flesh and Blood")
Qomar
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Qomar singing holographic matrix
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The Qomar singing holograpic matrix
The Qomar singing holographic matrix was a hologram created in 2376 by Tincoo, a Qomar mathematician. She was inspired to create the hologram by The Doctor.
The hologram shared the same appearance of The Doctor, with the difference of looking like a Qomar, instead of a Human. It was designed to sing far more complex musical compositions than The Doctor was capable of. Specifically, it was designed to extend the range of humanoid vocal capabilities, to the extent that The Doctor would have only been able to match its range by deleting some of his medical databases to create additional space in his matrix. (VOY: "Virtuoso")
Think Tank
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Malon hologram
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A Malon hologram
The Malon hologram was a ruse by "Think Tank" member Kurros in 2375 to disguise himself and trick the Hazari into believing that they were hired by the Malon to capture the USS Voyager.
Captain Janeway discovered an isomorphic signature embedded in the hologram giving the true appearance of the individual who placed the bounty on Voyager, Kurros. (VOY: "Think Tank")
Vori
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Commandos
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These five photometric projections of Vori commandos were part of the fourth Vori Defense Contingent, led by team leader Brone. Rafin and Namon were also among the fourth contingent commandos. They found Commander Chakotay in the forest and took him with them. Later, they fought against several Kradin soldiers and were killed by the Kradin. (VOY: "Nemesis")
Rafin's uncles
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Rafin spoke to Chakotay of his uncles and brothers who were in the clash, and told him that "Risking [his] own days and nights to drive the nemesis from our sphere. That should be as easy as a long sleep." (VOY: "Nemesis")
Scout walker
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A dead soldier
This Vori was part of the psychological conditioning and training illusion Commander Chakotay experienced in 2374. He was found neck-strapped on the ground in the forest by night, upturned to deny his entrance to the Gloried Way After. According to Brone, he was a scout walker for the seventh contingent. (VOY: "Nemesis")
Villagers
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These photometric projections of Vori villagers lived in the Larhana settlement when Commander Chakotay found the settlement. They cared for Chakotay until he left the settlement. When they were attacked by a group of Kradin soldiers, they took the lederly and ill Vori to an extermination facility including Penno and Karya.
After Chakotay was rescued by Tuvok, he learned that they all were photometric projections as he came to the settlement a second time but none of the villagers remembered him. (VOY: "Nemesis")
Xyrillian
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Qo'noS program
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Qo'noS surface
Qo'noS recreated in a Xyrillian Holographic chamber. The Xyrillians promised to share their hologram technology, so the Klingons would not destroy the Xyrillian ship. (ENT: "Unexpected")