I can see that there's no sync support for thunderbird/lightning. Is there any linux app that allows me to have access and be able to add/modify my zoho calendars while off-line?

I'm not always connected and it's great to be able to download my zoho calendars to view them when I'm in the subway or at a client where I can't go online, but it would be great to have the possibility of adding events to my calendar in my computer and then have my zoho calendar sync with that, so everything is available to me everywhere.

Thanks!

Alex