Tahskr
tahskr is a simple, open source, self-hosted todo manager. There are two parts to tahskr. The server side that stores and serves data (that's this container) and the frontend that provides a web interface accessible from a mobile/desktop browser or Windows Electron app. Both parts can be self-hosted but you only really need to self-host the server side as tahskr.com or the published Electron app can be used to access data on any tahskr server.