I moved from netbeans to atom. Tested lighttable, brackets and visual studio code, but at the moment I take a look into web based IDEs. Most are based on ACE editor (alternative could be codemirror) like chrome apps caret or super neutron drive (both with chrome dependency at the moment).
Recently I looked into cloud9, codetasty, ... and codiad.
Codiad is open source. php / js based and works fine. Autocomplete feature and suggestions should be improved, but it's ok. Because it's open source you can download it from github repo or test it as a docker container (wernight/codiad image for example).
Codytasty is a cloud hosted solution with a really awesome autocomplete / suggestions for php, js and html! But it isn't open source (there is a free to use hosted version with limited workspaces and features).
At the moment I testing codiad@docker, but use still atom for coding and searching for the best IDE out there *g*
What do you think about IDEs and the new trend to web based IDEs?