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The base version of IntelliJ is FOSS, and they kinda offer perpetual licenses for their paid applications. If you subscribe for an entire year, you get a perpetual fallback license. It’s just a license for an older version of the software, but you get to keep it forever. https://sales.jetbrains.com/hc/en-gb/articles/207240845-What-is-a-perpetual-fallback-license