is a spell-checker that groups potential misspellings and shows them in their contexts. This is useful for checking technical documents that often contain words that are not included in standard dictionaries.
The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Calendars and address books are available for both local and remote access, possibly limited through authentication policies. They can be viewed and edited by calendar and contact clients on mobile phones or computers.