Suggestions for pbox

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

Package makebox: Defines a \makebox* command
Package fitbox: Fit graphics on a page
Package ascmac: Boxes and picture macros with Japanese vertical writing support
Package boxedminipage: Framed minipages of a specified total width (text and frame combined)
Package dashbox: Draw dashed boxes
Package eqparbox: Create equal-widthed parboxes
Package efbox: Extension of \fbox, with controllable frames and colours
Package fbox: Extended \fbox macro from standard LaTeX
Package fancybox: Variants of \fbox and other games with boxes
Package longfbox: Draw framed boxes with standard CSS attributes that can break over multiple pages
Package minibox: A simple type of box for LaTeX
Package xcoffins: Rich boxed material for LaTeX 3
Package varwidth: A variable-width minipage
Package verbatimbox: Deposit verbatim text in a box
Package grabbox: Read an argument into a box and execute the code afterwards
Package settobox: Assigning dimensions of a box to a length register
Package setouterhbox: Set hbox in outer horizontal mode
Package collectbox: Collect and process macro arguments as boxes
Package realboxes: Variants of common box-commands that read their content as real box and not as macro argument
Package multibox: Multiple boxes and frames for the picture environment
Package xsavebox: Saveboxes for repeating content without code replication, based on PDF Form XObjects
Package boites: Boxes that may break across pages
Package tcolorbox: Coloured boxes, for LaTeX examples and theorems, etc.
Package mdframed: Framed environments that can split at page boundaries
Package framed: Breakable framed and shaded boxes
Package alertmessage: Alert messages for LaTeX
Package lroundrect: LaTeX macros for utilizing the roundrect METAPOST routines
Package nccboxes: Elaborate box commands
Package shadbox: Shade the background of any box
Package parboxx: Two extra alignment options for \parbox
Package callouts-box: Provides visually appealing callout boxes