Llama.vim is a Vim plugin that provides local LLM-assisted text completion, allowing users to auto-suggest code and text with the help of a local LLM server. The plugin supports features such as auto-suggestion on cursor movement, instruction-based editing, and control over max text generation time. It also provides performance stats and supports large contexts even on low-end hardware. The plugin can be customized and configured to work with different LLM models and settings.