Interesting thought! I have seen many newcomers coming from platforms like you mentioned above and stay and contribute for a long time. Many newcomers visit these sites in order to kickstart their open-source development. If few of the beginner bugs get posted on these websites, we can get a lot of new contributors. The bugs that we usually provide to Google Code-In students, would be a decent way to start, in my opinion. :)

All listed items seem to refer to Github tasks only:

• http://www.firsttimersonly.com/ - for Github tasks only, by marking tasks with the label first-timers-only
• http://up-for-grabs.net/#/ - for Github tasks only, after manually providing a URL (for some label) to them (but Bryan says it links directly to our Phab, yay)
• https://hacktoberfest.digitalocean.com/ for Github tasks only, annually in October, by marking tasks with the label Hacktoberfest
• http://issuehub.io/ - that page seems to crawl all Github tasks for certain tags anyway...
• https://openhatch.org/ see T146969#4457369
• https://yourfirstpr.github.io/ - no activity since April 2017 on https://twitter.com/yourfirstpr ?

https://up-for-grabs.net/#/tags/php includes this:

Which links to good first task.

HacktoberFest is arriving. Potential opportunity to bring newcomers to Wikimedia Tech. :)

In T194557#4619695, @wassan.anmol117 wrote:

HacktoberFest is arriving. Potential opportunity to bring newcomers to Wikimedia Tech. :)

The difficult part of Wikimedia participation in Hacktoberfest is that it is a GitHub pull-request based contest. There are a few Wikimedia software projects which use GitHub as their canonical workflow, but the large majority of our software projects do not process pull requests from GitHub at all.

Was looking at this again now that we have a nearly complete list of canonical (means: not mirrored) Wikimedia repositories on Github thanks to T186736.

However, Github does not support a logical OR when searching for open issues. Which makes it very scattered to search for [label:"beginner friendly" user:commons-app is:issue is:open](https://github.com/search?l=&q=label%3A%22beginner+friendly%22+user%3Acommons-app+is%3Aissue+is%3Aopen&type=Issues) but also label:"first-timers-only" (mentioned above) or label:"Hacktoberfest" (mentioned above) and having 12 users and/or currently 473 repositories (which would lead to a HTTP 414 URI Too Long error anyway if OR was supported).