llm is Simon's command line front-end to a lot of the llm apis, local and cloud-based. Along with aider-chat, it's my main interface to any LLM work -- it works well with a chat model, one-off queries, and piping text or output into a llm chain. For people who live on the command line, or are just put-off by web interfaces, it's a godsend.
About the only thing I need to look further abroad for is when I'm working multi-modally -- I know Simon and the community are mainly noodling over the best command line UX for that: https://github.com/simonw/llm/issues/331