Suggestions for soulpos

The following packages have something in common with the package soulpos. The packages are ordered in decreasing similarity.

Package soul: Hyphenation for letterspacing, underlining, and more
Package dashundergaps: Produce gaps that are underlined, dotted or dashed
Package ulem: Package for underlining
Package lua-ul: Underlining for LuaLaTeX
Package microtype: Subliminal refinements towards typographical perfection
Package spacekern: Kerning between words and against space
Package noitcrul: Improved underlines in mathematics
Package ligtype: Comprehensive ligature suppression functionalities
Package nccstretch: Insert a stretch between each token of a string
Package ushort: Shorter (and longer) underlines and underbars
Package umoline: Underline text allowing line breaking
Package tracking: Adjust tracking of strings
Package typog: Typographic fine-tuning and micro-typographic enhancements
Package underlin: Underlined running heads
Package handstroke: Eye-catching hand-drawn underline
Package attachfile2: Attach files into PDF
Package attachfile: Attach arbitrary files to a PDF document
Package pdfmarginpar: Generate marginpar-equivalent PDF annotations
Package repltext: Control how text gets copied from a PDF file
Package hypgotoe: Links to embedded files
Package pst-pdf: Make PDF versions of graphics by processing between runs
Package href-ul: Underscored LaTeX hyperlinks
Package caption2: Superseded version of the caption package
Package cuted: Mixing onecolumn and twocolumn modes
Package newproof: Make commands to define proofs
Package resizegather: Automatically resize overly large equations
Package exam: Package for typesetting exam scripts
Package fvextra: Extensions and patches for fancyvrb
Package llncs: Document class and bibliography style for Lecture Notes in Computer Science (LNCS)
Package pythonhighlight: Highlighting of Python code, based on the listings package
Package authblk: Support for footnote style author/affiliation