You can embed a Google Drive Form in a similar manner. Look for the "Embed Form in a Web Page..." option in the Spreadsheet/Form menu, and copy the html code provided. Add a Simple Text Block element to your Commonspot page and paste the code copied from Google Drive. The embed code includes height and width attributes. You can modify those to fit the form in your web page.
Similarly, you'll use the Commonspot Simple Text Block element to include the html code for a Google Drive Chart. You can create a chart for a Google Spreadsheet, and then use the chart's Publish menu to generate a static image or an 'interactive' chart that will display future changes applied to the original spreadsheet.
In either case, the Publish form will generate a string of HTML code. Copy that code and paste into the simple text element to display the chart in your page.