There are quite a few pure ruby gems to deal with excel files with various degree of success. This gem's approach is to use powerfull software like Apache POI and simply provide ruby like interface.

A Ruby spreadsheet parser for Excel (xlsx, xlsm).

Assign random pairs from a google docs spreadsheet

Princess is an Excel and Excelx spreadsheet reader

Rails Engine where importers can be defined for massive spreadsheet/csv load of data, based on your needs

Roo::Google extend Roo to support google spreadsheet files.

A gem to read google spreadsheets

A gem for simply rendering xls.

Apppend rows to a Google Sheets spreadsheet. Uses Google Sheets API v4 with server-to-server authentication

This gems allows simple management of translations from google spreadsheets - it converts google document into yml files

create documents with instructions in spreadsheets

Simple spreadsheet implementation

Use spreadsheet views in Rails 3

A nice extension for building xls spreadsheets

Convert vocabularies created in a spreadsheet template to SKOS.

A VERY simple Ruby SpreadsheetML API

Just another HTML table generator

Spodunk stands for "spreadsheet" + "podunk"

Spreadsheet Accessor.

model-like class without database using google spreadsheet