Suggestions for sublabel

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

Package smartref: Extend LaTeX’s \ref capability
Package aliascnt: Alias counters
Package chngcntr: Change the resetting of counters
Package totalcount: Commands for typesetting total values of counters
Package totcount: Find the last value of a counter
Package balance: Balanced two-column mode
Package fullpage: Set all page margins to 1.5cm
Package autonum: Automatic equation references
Package crossreftools: Expandable extraction of cleveref data
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: A new reference scheme for LaTeX
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 cleveref: Intelligent cross-referencing
Package fncylab: Alter the format of \label references
Package refstyle: Advanced formatting of cross references
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 nameref: Make reference to section names, etc.
Package remreset: Remove counters from reset list
Package perpage: Make a counter reset at every page boundary
Package authblk: Support for footnote style author/affiliation
Package figcaps: Collect figure captions for later printing