For the last 3 years I've been printing several copies of the Compact Calendar by David Seah [1]. It's as its name implies a compact form calendar that spans the whole year in a single page, and leaves enough side space to annotate stuff as needed. It's very cool and useful, although it would be nice having an open-source based version (i.e. LibreOffice), for those of us that don't have an MS Office license... [1]: h…
What do you mean “open source”? XLS is the (previously proprietary) format used by older versions that’s (basically) just serialized structs. XLS X (which I see here) is the ZIP/XML based version based on an open standard[0][1]. LibreOffice opens those just fine from my experience; It’s the older binary format that LibreOffice can screw up with formatting. [0]: https://en.m.wikipedia.org/wiki/Office_Open_XML [1]: ECM…
Microsoft doesn't even bother to support the OOXML format completely, as the Wikipedia article notes.