Zoho could be defined as an online office suite that includes all types of office applications such as text editor, spreadsheet, presentation editor, databases, task scheduler, wikis, ...
Using Zoho is as easy as accessing your official site and registering. In principle it does not require downloading and installing any specific application. It has as limitation of storage 1GB.
All Zoho applications have been developed for use via the web and thus are independent of the operating system.
It is important to make it clear from the outset that, of these tools, only some are free, which are often referred to as the first level. If you want to have access to all of them you have to subscribe to certain modules with an associated economic cost.