zabatonni

Automatically finds duplicate terms (with same name) in each taxonomy, then moves posts from duplicates to its original terms and deletes duplicate terms.
You can choose which duplicates you want to merge and delete.

Merge duplicate terms

Plugin for easy merging duplicate terms (tags, categories, ...)

Have you ever wanted to copy part of a Weaver design to another design? Now you can. 
Load two option sets and pick and choose which values will be combined into the output 
settings file.
This plugin provides options sets to merge with your options, including color sets and 
styling sets (shadows, gradients, text effects). The color set colors work together, 
meaning that some are transparent to let others show through. If merging with your own 
design, be aware of the interplay with background images. The styling sets use the same 
style everywhere it makes sense, so that you can merge the CSS in the options you choose.

Weaver Options Merge

Merge theme settings from two Weaver II, Aspen, or Weaver Xtreme saved settings.

Merge duplicate terms vs Weaver Options Merge