Logstash Official Filter Collection

Hi,

Is there any official repository of logstash filters for all the most common used technologies like databases, app servers, network devices etc?

You mean other than what is listed in the docs - https://www.elastic.co/guide/en/logstash/2.1/index.html?

Do you mean grok patterns? They are linked in the docs:
https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html