📌 Common Uses of Markdown
1. Software Development & Documentation

README.md → Every GitHub/GitLab/Bitbucket repository usually has one. It’s the project’s front page.

Wiki pages → Many dev platforms (GitHub, GitLab, Azure DevOps) use Markdown to format project wikis.

Issue tracking & pull requests → Comments, task lists (- [ ]), and formatting are all Markdown.

2. Note-Taking & Knowledge Management

Obsidian → Entire vaults are Markdown-based, with backlinks and graph views.

Notion, Logseq, Foam, Joplin, Zettlr → All rely on Markdown or variants.

Personal knowledge bases → People store research, journaling, or project logs in Markdown for long-term portability.

3. Publishing & Static Websites

Jekyll, Hugo, MkDocs, Docusaurus → All take .md files and turn them into fully styled websites.

Blogging platforms like Ghost or Hexo → Write in Markdown, publish as HTML.

Documentation sites → Many modern docs portals (e.g., Microsoft’s docs, Terraform docs) are Markdown-driven.

4. Technical Writing & Education

Scientific notes with Markdown + LaTeX ($E=mc^2$).

Pandoc workflows → Convert .md to PDF, DOCX, LaTeX, slides (Reveal.js), etc.

Course notes and study guides → Easy to write and share without worrying about formatting tools.

5. Productivity & Collaboration

Slack, Discord, Mattermost → Use Markdown-like syntax for emphasis, code blocks, bullet lists.

Trello, Jira, GitHub Projects → Many task descriptions support Markdown.

Email drafting → Some tools (like Fastmail, Proton, or plugins for Outlook/Gmail) let you compose in Markdown.

6. Publishing eBooks

Leanpub → Lets authors write books entirely in Markdown, then outputs EPUB, PDF, MOBI.

Pandoc workflows → Turn Markdown into professional-grade eBooks.

7. Other Niche Uses

Game development wikis (modding docs often use .md).

Config & changelogs (CHANGELOG.md, CONTRIBUTING.md).

Documentation inside code editors (VS Code extensions often use Markdown for docs/help panels).

Chat export & archival → Some people export chat logs (Slack, Discord, ChatGPT…) into Markdown for searchable archives.

🌍 Why it’s everywhere

Human-readable (you can read it in plain text without special tools).

Machine-friendly (easy to parse and convert to HTML, PDF, etc.).

Lightweight compared to DOCX or HTML.

Future-proof → unlikely to become obsolete, since it’s just text.

👉 Since you’re building standardized tools (Subtitle Shifter, Audio Amplifier, Worldtime), Markdown would let you:

Keep project notes in one uniform format.

Export/share them easily.

Even generate user docs or websites from the same .md files.

Would you like me to sketch a multi-purpose Markdown template for you — one that could work as both a conversation archive and project log? That way, you could apply it across all your tools.