Notes

http://scp-wiki.wikidot.com/tanhony-s-proposal
The council has been naughty, and the ethics committee does not like it

SPOILER FOR THE STORY: Man has been tied to the concept of death, and things that happen to the man cause things to happen to death itself. The council made the man forget that they exist, so the council is now immortal. Some unknown person sends this information to the Ethics Committee, and they decide to raid the council and replace them. They fight and the council loses, but the unknown person meets with the man tied to death. They talk, and the unknown person kills themselves. It is revealed after that the unknown person who killed themselves was the Administrator (The Administrator is a mysterious person who may have founded the foundation).

http://scp-wiki.wikidot.com/shaggydredlocks-proposal
The sun turns any person that is exposed to it into a flesh monster, and the main character looks at the file on the sun.

SPOILER FOR THE STORY: The main character finds a Foundation computer and uses it to look up the file on the sun. He finds video logs from a Dr. Igotta who is hiding with others at a Site. Her friend becomes a flesh monster, and tries to use an SCP to bring them back. The main character notices the file was updated, and checks to find it has been replaced with a poem. It includes a live video feed looking at the main character's head, and the main character turns to find a ghostly hand reaching for them (The person that wrote the poem and the ghostly hand are implied to be the ghost of Ari, Igotta's friend). He fires at it, but the flesh monsters notice and take the main character away.

http://scp-wiki.wikidot.com/scp-001-o5
A tale about the origins of the Foundation.

SPOILER FOR THE STORY: The Factory was a supernatural establishment making anomalous items, using workers that lived at the Factory. A worker escaped, and the government sent a squad of people in to investigate. They found horrible things, including child prostitutes, bodies sewn together then reanimated, and very injured people. They cleaned out the building and killed the owner, then created the Foundation as a place to store the strange objects. Another race called faeries was found, and went to war with the Foundation. The Foundation was losing, but the founder made a deal with the ghost of Anderson. With the ghosts help, the faeries were destroyed. They destroyed the Factory, but a gun with the Factory's label appeared on the founder's table. Ever since, the Foundation has been sacrificing people to the Factory.

http://scp-wiki.wikidot.com/sandrewswann-s-proposal
Highly recommended (only read after reading the proposal) https://scp-wiki.wikidot.com/scp-5500/offset/1
God is real, and it's a bunch of horror writers. The Foundation finds out about the writers dictating them from another universe.

SPOILER FOR THE STORY: The Foundation discovers that their reality is being influenced by the writers being the scp wiki, and that the wiki controls their every move.

SPOILER FOR SCP-5500: This is the meat, if the proposal was the bones. Deaths of the authors for the SCP wiki cause the Foundation to shift to match if they hadn't existed. For example, the deaths of one of the writers caused multiple SCP objects to disappear in multiple universes. To investigate this, they built a machine to temporarily kill someone and send them to take the place of one of the "horror writers" in their (our) world. It was successful, but it caused the "horror writer" to die from psychic backlash. This caused multiple SCPS in many universes to die. One of the people working on the machine tries to sabotage it, causing 2 members of the O5 council, the person sabotaging it, and multiple SCPS to disintegrate. The machine is used to attempt to communicate with one of the "horror writers", and the Foundation finds out that the sabotage caused thousands to die in the writer's universe.

The final part of the article is an interactive minigame, where multiple endings are possible.

http://scp-wiki.wikidot.com/ouroboros
One of the longest solo works on the site. A story in 4 acts. No summary can do it justice, read it.

Features the Foundation in its early days, the founding of the Chaos Insurgency, the Church of the Broken God and the being they worship, the Unusual Incidents Unit of the FBI, the Horizon Initiative, interviews, research papers, letters, transcripts, the destruction of a large portion of Mexico, a malevolent entity slowly rebuilding itself with metal, singularities, the destruction of dozens of parallel universes, documents recovered from the GOC and Chaos Insurgency, settings in many nations all over the globe, descriptions and stories for all 13 of the overseers, deals with death itself, the death of the Overseers and more.

https://scp-wiki.wikidot.com/scp-5000
What happens when the Foundation changes its goal?