Robuta

https://www.boost.org/doc/libs/1_58_0/libs/icl/doc/html/boost/icl/left_open_interval.html

https://www.boost.org/doc/libs/1_81_0/libs/icl/doc/html/boost/icl/interval_traits_i_idm38233.html

https://www.boost.org/doc/libs/1_50_0/libs/icl/doc/html/header/boost/icl/left_open_interval_hpp.html

https://f-droid.org/en/packages/dev.randombits.intervaltimer/

https://www.boost.org/doc/libs/1_58_0/libs/icl/doc/html/header/boost/icl/right_open_interval_hpp.html