Suggestions for Showlabels

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

Package showkeys: Show label, ref, cite and bib keys
Package crossreftools: Expandable extraction of cleveref data
Package zref: A new reference scheme for LaTeX
Package cleveref: Intelligent cross-referencing
Package nameref: Make reference to section names, etc.
Package listlbls: Creates a list of all labels used throughout a document
Package checklab: A patch for the label-checking code
Package labelcas: Check the existence of labels, and fork accordingly
Package pagerange: Flexible and configurable page range typesetting
Package smartref: Extend LaTeX’s \ref capability
Package refcheck: Check references (in figures, table, equations, etc)
Package autonum: Automatic equation references
Package fancyref: A LaTeX package for fancy cross-referencing
Package footnoterange: References to ranges of footnotes
Package refcount: Counter operations with label references
Package undolabl: Override existing labels
Package xr-hyper: Inter-document hyper-references
Package zref-check: Flexible cross-references with contextual checks based on zref
Package zref-clever: Clever LaTeX cross-references based on zref
Package zref-vario: Extended LaTeX page cross-references with varioref and zref-clever
Package fncylab: Alter the format of \label references
Package refstyle: Advanced formatting of cross references
Package sublabel: Sub-number counters
Package totpages: Count pages in a document, and report last page number
Package labelschanged: Identify labels which cause endless may have changed warnings
Package prettyref: Make label references self-identify
Package titleref: A \titleref command to cross-reference section titles
Package lastpage: Reference last page for Page N of M type footers
Package xr: References to other LaTeX documents
Package bibtopic: Include multiple bibliographies in a document
Package chapterbib: Multiple bibliographies in a document