Forebruary is a wall calendar that you do not need to replace every year (2013)
Side-note on digital calendars: What I'd really like is a continuously scrolling calendar to help with long-ish term planning (3-4 months). Most apps are stuck in the single-month page view analogy to physical calendars, which for me keeps breaking my mental flow of stringing activities across the boundary/long distances. And I get why (standard behavior/components and user expectations) but it just seems like a missed opportunity. Not sure how many want this but I suspect more would do if they were exposed to it.A few calendar apps allow a stretch of >4 weeks and there's this POC web version: https://madebyevan.com/calendar/app/ but all I can do for now is constantly switch from a Gantt app to my calendar app (Thunderbird or Google Calendar).