Continue
Use configurable coding agents inside VS Code, JetBrains and the terminal.

Overview
Continue offers open-source coding assistance with agent, chat, edit and autocomplete modes. Install its official IDE extension, configure a supported model and select the project context to expose. Local model connections can be used where supported.
Coding · IDE · Agents
Install for free from the official publisher
Original source & installation instructions
Extension installation is free; model APIs, hosted services and enterprise features may cost extra. Review what project context is sent externally.