JExcel Features

JExcel contains features like:

Export (with comments, images and attachments)You can export your issues with the comments, images and attachments
Import from Excel or NotepadYou can import issues from MS Excel into JExcel
CollaborationYou can invite people to work with you on workbooks and see who is working on a workbook right now
Excel like UI with in-place editYou can edit all the cells (issue fields) inline
Excel like filteringYou can filter without JQL knowledge just like in MS Excel
Copy-paste issues and values (internally and to/from MS Excel)You can copy paste values or even whole issues internally and also to/from MS Excel
Column resizingYou can rename and resize any column
Tab colouringYou can colour the title of your workbooks
Hide/Unhide columnsIt lets every user have a unique view of their workbook without affecting other users of the given workbook
Average/Count/Sum of the selected cellsYou can see the Average/Count/Sum of selected cells just like in MS Excel
Pin ColumnsYou can pin columns
No. of Comments and Attachments columns

You can see the number of Comments and Attachments for an issue in 2 special JExcel columns