Sign-up Sheets WordPress Plugin - Fetch Designs
The Sign-up Sheets WordPress Plugin is an online sign-up sheet manager where your users or volunteers can sign up for tasks that you set up.
Embed live Excel spreadsheets in web pages using our Free WordPress Plugin - iPushPull
Free Excel Wordpress PlugIn lets you display live Excel data in your webpages when you’re using desk...
Inline Google Spreadsheet Viewer
Embeds public Google Spreadsheets, Apps Scripts, or CSV files in WordPress posts or pages as HTML tables or interactive charts, and more.
Spreadsheet « WordPress Plugins