tmplink: write Markdown in a split-pane editor with live preview, publish with one click, and get a shareable link that auto-deletes after 7 days. No signup. The feature I find most useful is slide mode. Use `---` separators and your Markdown becomes a navigable presentation with keyboard/swipe controls using Marp. Every link also auto-generates an OGP image for rich previews on Slack/X.