Well, it's not that simple. Tonido has a free version, which allows you to create only 5 links to your files. It is way too limited in general, not mentioning as a Dropbox alternative. If you want more than 5 links, you have to pay $29 every year. FileRun for a single user has a one-time fee of $39 and has no such limitations. But the light version of Tonido might be good enough for some private users with very light usage. FileRun was designed for work environments. Not really. Dropbox is popular because it makes your life ease. Not any PHP file manager in combination with BTSync achieves that. You cannot access files on the server or create shares from the remote BTSync apps. If you want a new folder on your computer or phone, you cannot do it from your common PHP file manager, but you have to access the Web GUI of the BTSync installed on your server. You will there browse the server for the folder you want to share and get the secrets. The PHP file manager will just be a frontend to the files on the server, no interaction with BTSync. Edit: I should add a mention here. Some people don't mind spending time learning a new programming language to get an app installed, editing XML files to configure it and using SSH to manage their online files. This topic is about replacing Dropbox, which is more popular among the rest of the people. My recommendations are for this type of people.