Suggestions for extdash
The following packages have something in common with the package extdash. The packages are ordered in decreasing similarity.
- ncccomma: Use comma as decimal separator in mathematics
 - mboxfill: Fill free space with a pattern
 - nccboxes: Elaborate box commands
 - nccstretch: Insert a stretch between each token of a string
 - nccparskip: Modify skips between paragraphs
 - watermark: Draw “watermarks” on the output page
 - nccfoots: User-generated footnote marks
 - nccfloats: Extensions of the LaTeX float mechanisms
 - nccrules: Compose dashed lines
 - nccsect: A re-implementation of sections, captions and tocs
 - topsection: An un-numbered top level section
 - tocenter: Centring (and other) Page Layout
 - textarea: Control the text area dynamically
 - manyfoot: Adds footnote levels to standard LaTeX’s footnote mechanism
 - ncctools: A collection of general packages for LaTeX
 - nccmath: Extended mathematics capabilities
 - afterpackage: Add commands to package after it's loaded
 - nccbbb: “Poor man’s” blackboard bold
 - desclist: Extended “description” lists
 - nccthm: Another theorem environment
 - nccfancyhdr: Extensive control of page headers and footers
 - nccpic: Extend the graphicx package for more formats
 - ncccropmark: Draw cropmarks on the output page
 - ncccropbox: Crop-marked boxes
 - copyrightbox: Provide copyright notices for images in a document
 - manuscript: Emulate look of a document typed on a typewriter
 - decimal: LaTeX package for the English raised decimal point
 - eqell: Sympathetically spaced ellipsis after punctuation
 - emarks: Named mark registers with e-TeX
 - foreign: Systematic treatment of ‘foreign’ words in documents
 - lips: Text ellipses in LaTeX