We use Airtable, a cloud-based database service. The sheets and cells can be manipulated like those in Microsoft Excel. The sheets and cell can also be read on mobile devices. It is still in construction, and hence can be only read and heard, downloading is not possible as of now.
Further, 1) It is basically free up to 2000 lines (with pedagogic reductions for larger data), 2) it can be written and read quite easily, and 3) it can be maintained by members from all over the world