Sure, here are some notable game decompilation projects:

```md
1. **Super Mario 64:** This project started in 2004 and was completed in 2015. It is the first 3D game to be fully decompiled.
2. **The Legend of Zelda: The Ocarina of Time:** This project started in 2015 and was completed in 2021. It is one of the most popular games of all time and its decompilation has been a major achievement for the emulation community.
3. **GoldenEye 007:** This project started in 2018 and is still ongoing. It is one of the most popular first-person shooters of all time and its decompilation has been met with much excitement from fans.
4. **Half-Life:** This project started in 2015 and was completed in 2020. It is one of the most influential games of all time and its decompilation has allowed for new mods and improvements to be made to the game.
5. **Grand Theft Auto III:** This project started in 2018 and is still ongoing. It is one of the most popular open-world games of all time and its decompilation has allowed for new mods and improvements to be made to the game.
```

The legality of decompilation projects varies depending on the country and the End User License Agreement (EULA) of the game in question. In the United States, it is generally legal to decompile a game as long as the software was obtained legally. However, if the EULA prohibits decompilation, then it may be considered a breach of contract. The Digital Millennium Copyright Act (DMCA) also has some implications for decompilation projects. For example, it is illegal to distribute decompiled code without the permission of the copyright holder.

Decompilation projects can be a valuable tool for game preservation. They can help to ensure that old games are not lost to time and can also be used to create new mods and improvements to games. However, it is important to be aware of the legal implications of decompilation before undertaking a project.