-
Omeka
A flexible web publishing platform for the display of library, museum and scholarly collections, archives and exhibitions.
-
InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
A popular alternative is Omeka, which can't directly be used with WordPress but does have some workarounds to effectively show the digital collection in a frame. Search the Omeka forum for more info.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.