Another top contender is Codeium, which supports more than 70 programming languages and works with top IDEs. It's got fast and accurate autocomplete, AI-powered search and an AI chat assistant that can explain code, generate documentation and suggest bug fixes. That means it can be useful for both solo developers and teams.
If you prefer to integrate with your own IDE, TLDR is a useful plugin that uses AI to explain code in plain English. It works with almost all programming languages and is particularly adept at explaining complex code elements like regular expressions and SQL queries. It's available in a free version with limited API credits and has other tiers for heavier use.