content: How about Cryptocat?  Signal's parent company, Open Whisper Systems, has indirectly allowed more than a billion people access to indisputably strong encryption. Cryptocat's own development was strongly influenced, and has influenced, these tools: we adopted a variant of Signal's encryption protocol in March 2016, which was clearly superior to our own, and our early research on client-side web encryption in 2011 set the stage for SecureDrop and Mailvelope (another recommended tool) to follow in using similar engineering fundamentals, oftentimes by learning through our own early engineering mistakes and thereby avoiding them.  https://crypto.cat/news.html#nytltr