Apart from various official sources such at bahn.de, sbb.ch, or bene-system, there exists a HAFAS ReST Interface that offers options that are not presented in the typical web frontends. For example, there appears to be an option to avoid certain stations (see also this question), to include/exclude specific train operating companies, to configure walking speed, or to filter routes based on expected occupancy. All of those would seem potentially useful for "advanced" train travel planning.

Are there 3rd party websites that expose some of those more unusual search options to the public, for people who have no time or skills to use the ReST API directly?

Or maybe those advanced options exist in the software in theory, but aren't actually implemented/used in the API for European train companies?

Apart from various official sources such at bahn.de, sbb.ch, or bene-system, there exists a HAFAS ReST Interface that offers options that are not presented in the typical web frontends. For example, there appears to be an option to avoid certain stations (see also this question), to include/exclude specific train operating companies, to configure walking speed, or to filter routes based on expected occupancy. All of those would seem potentially useful for "advanced" train travel planning.

Are there 3rd party websites that expose some of those more unusual search options to the public, for people who have no time or skills to use the ReST API directly?

Or maybe those advanced options exist in the software in theory, but aren't actually implemented/used in the backend for European train companies?