I know this is an old thread, but I wanted to jump on and contribute this response for anyone else who may wander by in the future. I found WaveMaker at https://wavemaker.co.uk/. For writing anytime or anywhere, this software cannot be beat! Here's what it can do:
Synch your work to any computer, anywhere, at any time.
Works in your browser or can be downloaded locally.
Works on ANY device with an internet browser.
Works offline.
100% COMPLETELY FREE!
As if those things weren't enough, it has a METRIC CRAPTON of other features. I won't get into them here because frankly, I haven't used them all. But, if you go to the website, they're all laid out there. I'm telling you, for anybody looking for a flexible writing app, LOOK. NO. FURTHER. WaveMaker's got you covered.
For the record: NO, I'm not getting any kind of kickbacks or anything for promoting this software. It took me forever to find this software. Unfortunately, I had already spent money on other options before I did. So, I am hoping to help others put an end to their writing software blues by getting this info in their hands.