...
Drawing - Gliffy
Prototyping - Balsamiq
...
jEvaluating
Spreadsheet Functionality in Tables
Must work in mobile. Integrate with existing Confluence Table inline.
Spreadsheets for Confluence - not able to meet criteria.
Comparison chart with key features:
| Plugin | Math Formulas | Inline Editing | Works in Mobile | Leverages Tables | Auto-numbering |
|---|---|---|---|---|---|
| Spreadsheets for Confluence |  |  | | | |
| Bob Swift Advanced Tables | Add only is not enough. Vote for multiplication. | | | | |
| Excellentable | | | | | |
Encryption
Looks promising, no public key, but simple enough - https://marketplace.atlassian.com/plugins/com.prcpo.confluence.plugins.secure-content-block
...