Suggestions for tabularx
The following packages have something in common with the package tabularx. The packages are ordered in decreasing similarity.
- dcolumn: Align on the decimal point of numbers in tabular columns
 - longtable: Allow tables to flow over page boundaries
 - hhline: Better horizontal lines in tabulars and arrays
 - delarray: Delimiters for arrays
 - array: Extending the array and tabular environments
 - ftnright: Footnotes in two column documents in one column only
 - verbatim: Reimplementation of and extensions to LaTeX verbatim
 - multicol: Intermix single and multiple columns
 - latex-tools: The LaTeX standard tools bundle
 - trace: Make sensible use of TeX tracing in LaTeX
 - xspace: Define commands that appear not to eat spaces
 - rawfonts: Low level font compatibility mode for LaTeX
 - somedefs: Save loading all of another package
 - afterpage: Execute command after the next page break
 - enumerate: Enumerate with redefinable labels
 - indentfirst: Indent first paragraph after section header
 - layout: View the layout of a document
 - shellesc: Unified shell escape interface for LaTeX
 - fontsmpl: Print a sample of a font
 - theorem: Manipulate theorem environments
 - varioref: Intelligent page references
 - calc: Simple arithmetic in LaTeX commands
 - bm: Access bold symbols in maths mode
 - latex-tools-dev: Development pre-release of the LaTeX tools bundle
 - fileerr: LaTeX’s mechanisms for dealing with file errors
 - showkeys: Show label, ref, cite and bib keys
 - xr: References to other LaTeX documents
 - cals: Multipage tables with wide range of features
 - ltablex: Table package extensions
 - xtab: Break tables across pages
 - nox: Adaptable tables