Open Street Map - a map of the world, created by people like you and free to use under an open license.
Organic Maps - a privacy-focused offline maps & GPS app for hiking, cycling, biking, and driving. Absolutely free. No ads. No tracking. Developed with love by the open-source community. Powered by OpenStreetMap data. Organic Maps is one of the few applications nowadays that supports 100% of features without an active Internet connection.
BeWelcome.org - the largest free hospitality community
Sleepy.Bike - Sleepy Bike is a community of bicycle touring travellers and those who want to host them.
WarmShowers.org - A global community of touring cyclists. Tour. Host. Support
TrustRoots.org - Travellers' community. Sharing, hosting and getting people together.
OpenHospitality.Network - designing a protocol to connect different hospitality exchange platforms to unify the community while enabling greater diversity and long term sustainability of all together.