Jaeger - Distributed tracing system released as open source by Uber
API List - A collective list of APIs. Build something.
Ensighten - Ensighten provides enterprise tag management solutions that enable businesses manage their websites more effectively.
Abstract APIs - Simple, powerful APIs for everyday dev tasks
Timber.io - Timber.io is the best logging platform for ruby, node, elixir and much more.
Phantombuster - A marketplace of simple to use no-code APIs