_Useless complexity_ (aka everything must be a service@scale even if it's not necessary at all) keeps cyber security companies in business.
- Tabular data : TSV (almost all Un*x/GNU tools handle this out of the box)
- Simple "records" : GNU Recutils format (https://www.gnu.org/software/recutils/)
- Formatted texts : Markdown, LaTeX, ...
- ...
If I need some hierarchical kind of information, I use a folder structure to handle this. - Images : PNG
- Music : FLAC, Ogg, ...
- If I really need to preserve orignal format/design of a web page: PDF
Nothing's perfect but stay away from any closed/obscure/proprietary formats.