I've registered a few domain names for soon-to-start projects:

- cheatsheetsdb.com - crowdsource them by topic, up/down votes to see which are good

- ispecsdb.com - similar to above but for various product specs

- stackflows.com - something to connect a slack channel's messages as input to a Kanban-like-board workflow (unclear use cases/design)

Past projects: (welcome any comments/suggestions)

[0] https://statuspages.me (all the statuspages on one page),

[1] https://gitgrep.com (hosted git search),

[2] https://quicklog.io (high-level events to narrow log viewing)