# Known to work ## System 1. [eSpeak](ESpeak.md), offline TTS support for more than 100 languages ## App Stores 1. [F-Droid](F-Droid.md), the OpenSource app store 2. [Aurora Store](AuroraStore.md), googels paly store accessed anonymously ## Browser 1. [Fennec](Fennec.md), firefox for mobile ## Messaging 1. [Signal](Signal.md), messaging over signals server, encrypted 2. [DeltaChat](DeltaChat.md), messaging over email, auto-encrypted 3. [Telegram](Telegram.md), messaging over somehows server, not encrypted, reads your contacts, not recomended ## Calendar, Contacts & Files 1. Finde some ideas described here: [Sync your data](sync_calendar.md) ## Navigation 1. [OsmAnd](OsmAnd.md), uses Open-Streetmap maps for offline navigation (pdestrian, cycle, car, truck ...), speech output possible.