So, I spun up something that you can see here: http://prefinem.github.io/HelpMeOut/. You can create an HMO by making a pull request to https://github.com/Prefinem/HelpMeOut using Jekyll's posts. Posts are searchable by title and tags (meta data from the post) and are discover-able under categories (assuming you put a category in your post that exists on the site)
If you want a new category, you can send me an email (on the site), post here, or make a pull request.