Hi - I answer from the OpenSmartRoute documentation: routing, the API, plans and quotas, self-hosting. Ask away, or open a support ticket if you need a person.
Grounded in the docs - follow a source before acting on it.
Chertov & Vorobyov physics problem solutions - Tool - OpenSmartRoute
Toolv1.0.0
Chertov & Vorobyov physics problem solutions
Read-only search and lookup over the Chertov & Vorobyov physics problem solutions (chertov.org.ua).