BibTeX collection organiser

Parses .bib content with its own brace-balancing parser: type, key and fields written as {value}, "value" or a bare number, nested braces, and comments outside entries. It returns a table of entries, duplicates found by equal DOI or by equal normalised title and year together with the reasons, suggested AuthorYyyyWord keys, statistics by type and year, and a corrected, sorted .bib for download.