In general yes, as long as it is strongly about OpenStreetMap.
And is not some press-release style.
See say `osm-river-basins`: Website to show how are rivers in OSM connected and OpenAEDMap - a map of Automatic External Defibrillators
In general: if primary reason is to make people aware of nice tool then it is welcome. If primary reason to post is to link your github repo, then likely it is not.