I'd be a bit careful with Open Office. I've used it a couple of times as a MS Office alternative, once on a Macbook and once on a desktop running Linux Mint. Both times caused problems when transferring files onto Windows PCs, even with text files, in one case losing data.
I'm no fan of MS Office, in fact I hate the subscription model of Office 365 which forces you to pay for a lot of stuff you don't need, but I would strongly recommend keeping a backup of your lists as plain text files or (perhaps even better) as a CSV file.