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What's in a Data Dictionary and more from USGS
Creating a Data Dictionary with template from USDA Ag Data Commons
Learning Data Analytics - LinkedIn Learning course includes Creating a Data Dictionary
Good list of metadata editors and tools from DataONE - includes editors for Geospatial and Ecological data as well as editors for more generic data.
Additional Metadata editors:
Morpho - Knowledge Network for Biocomplexity
Darwin Archive Spreadsheet Processor from Global Biodiversity Information Facility (GBIF) generates EML from a spreadsheet template
DDI Tools - List of Freeware and Commercial tools for working with DDI docs from Data Documentation Initiative (DDI)
EAD Toolkit - A variety of EAD related tools from the California Digital Library
TEI Tools from Text Encoding Initiative (TEI)
CDWA Lite Schema - XML schema from The Getty Research Institute
VRA Core schemas and documentation - from Library of Congress
You may need to use a crosswalk to convert your metadata to a different standard. Examples include:
FGDC to a variety of schemas - from NOAA
CDWA to VRA 4.0 to MODS to EAD - from The Getty