Gander

Gander is a Quick Look extension for the files developers open every day. Press Space in Finder to preview Markdown with Mermaid diagrams and GitHub-style alerts, JSON and JSONL, YAML, TOML and Terraform, SQLite databases, code in 30 languages with Finder thumbnails, diffs and patches, Jupyter notebooks with their outputs, log files that open at the newest line, property lists (including binary), XML, SQL, .env files (values hidden by default) and archives. TSV files show as a real table, and CSV and TSV can be exported to Excel. Markdown exports to PDF, Word, RTF and HTML. One app instead of a plugin per format.