https://stevecat.net/table-magic/
HTML | Markdown | SQL | ToolThe website can convert between different table formats. It supports CSV, Markdown, SQL, HTML. It is usefull when embedding CSV data into Markdown or similar.
https://www.tablesgenerator.com/
HTML | LaTeX | Markdown | ToolThe website let's you create very customizable tables. It supports splitting and merging cells, customized lines around each cell, and coloring. The website supports LaTeX, HTML, and Markdown output.
https://validator.w3.org/checklink
HTML | ToolThe W3C Link Checker crawls your website and reports broken or outdated links. The tool reports on broken links (e.g., 404), broken or missing websites, and links which should be updated to a new location.