collective.table is a replacement for the "store equipment lists, book loans, etc. in Excel files and upload to Plone". It's a list of items where members can add/edit columns and rows and of course data. By default, collective.table stores it's data in the ZODB, however storage is pluggable and it's easy to write storage adapters to have data stored in SQL, LDAP, etc.
Developer documentation is available at ReadTheDocs.org.
To install collective.table you simply add collective.table to the list of eggs in your buildout, run buildout and restart the Plone server. In Plone's portal_quickinstaller you select collective.table and install it.
Now you can add a Table content-type and start adding your tabular data.
Upon adding a new table you have to specify which columns you would like. You do that by entering column names, one per line, into columns field. When you click save your table will be created, containing one initial row. At the moment, all columns are of type string.
Double-click on a cell of your choosing and enter something. Hitting Enter will save this value.
Add a new row
Click the Create a new row button and a new row will be appended, which you can edit to enter your data.
Deleting a row
Start by selecting a row by clicking on it. Then click the Delete this row button and this row will be deleted. You can select and delete multiple rows.