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> Is there any Copilot alternative that is open source

In fact one was posted yesterday!

https://news.ycombinator.com/item?id=32327711

TabNine isn't open source but works with Vim: https://www.tabnine.com/install/vim

Tabnine is my personal favorite as it works with most IDEs including IntelliJ, Vim and even VSCode and the suggestions are high-quality. I actually moved away from Copilot to Tabnine across all IDEs and haven't gone back since.

I actually used Copilot in neovim and it works well (because the VS Code Copilot does not work in the open source VS Code build)

Not sure about 1, but I know for 2 you can use the vim VS Code extension as a good emulator.