There are a variety of geocoders that use OpenStreetMap data.
https://wiki.openstreetmap.org/wiki/Geocoding
Availability of address data varies by area.
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community
https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
There are a variety of geocoders that use OpenStreetMap data.
https://wiki.openstreetmap.org/wiki/Geocoding
Availability of address data varies by area.
If the information is wrong, you can easily correct this via your account on openstreetmap.org (as of one example on how to do this, also the best solution for lazy people). After you've saved the changes, the correct information will be searchable basically instantly.