If you're looking for an IDE plugin with a free version and easy installation/upgrades through a plugin marketplace, Codeium is one of the best options. It's an AI-powered coding assistant that supports more than 70 programming languages and integrates with major IDEs. It has features like advanced code completion, AI-powered search, and an AI chat for writing boilerplate code, refactoring, and suggesting bug fixes. The free tier is good for solo developers, but teams can upgrade to a paid plan with more features.
Another good option is TLDR, which uses AI to explain code in plain English. It supports almost all programming languages and is available in a free version with limited API credits and rate limits. The plugin is good for getting a quick grasp on complex code elements and can be installed directly into your IDE through the JetBrains plugin marketplace.
Safurai is also worth a look, especially if you want a general-purpose AI code assistant. It supports all programming languages and has features like textboxes for asking questions, code generation, and super search. A free plan is available for individuals, with more features in the Plus plan. It supports several IDEs, including VS Code and plans to support more.
CodeAI is a good option for VS Code users, with AI-assisted coding, unit test generation and documentation creation. It supports multiple programming languages and protects data with end-to-end encryption. The free "Newbie" plan offers 100 AI model calls per month, so it's good for light use.