Suggestions for paracol

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

Package parallel: Typeset parallel texts
Package parcolumns: Multiple column parallel typesetting
Package reledpar: Typeset scholarly editions in parallel texts
Package pdfcolparcolumns: Fix colour problems in package parcolumns
Package pdfcolparallel: Fix colour problems in package parallel
Package gb4e: Linguistic tools
Package qtree: Draw tree structures
Package expex: Linguistic examples and glosses, with reference capabilities
Package bilingualpages: Typeset two columns in parallel
Package parrun: Typesets (two) streams of text running parallel
Package pst-tree: Trees, using PSTricks
Package linguex: Format linguists’ examples
Package arcs: Draw arcs over and under text
Package eledpar: Typeset scholarly editions in parallel texts
Package ledpar: Typeset scholarly editions in parallel texts
Package pst-node: Nodes and node connections in PSTricks
Package tipauni: Producing Unicode characters with TIPA commands
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 covington: LaTeX macros for Linguistics
Package fragoli: Macros for constructing complex semantic derivations
Package leipzig: Typeset and index linguistic gloss abbreviations
Package numending: Generates morphological end of units
Package overword: Parse text
Package rst: Drawing rhetorical structure analysis diagrams in LaTeX
Package textglos: Typeset and index linguistic gloss abbreviations
Package dvgloss: Facilities for setting interlinear glossed text