With the development of network technology, our demand for file synchronization and backup is also becoming stronger. While various web disk services provide us with convenience, they also bring a lot of restrictions and risks in terms of speed, security and privacy. There are many cloud synchronization solutions, such as Seafile and Nextcloud, which are feature-rich but bulky and difficult to deploy cloud disk programs. But if we only need to synchronize files, then a better choice is Syncthing. In comparison, it is lighter, easier to deploy and use, more secure, and especially has faster file transfer.

DeltaWalker (AKA: Deltopia DeltaWalker) is an advanced and professional file and folder visualization comparison and synchronization software for Windows, Mac and Linux platforms. It has a lot of features and is powerful, but it pales in comparison to similar tools like Beyond Compare. Especially since it's written in Java and using the Eclipse IDE, the entire program is too bloated, which is something AppNee can't stand.

FTP Synchronizer is a high-performance and user-friendly FTP file synchronization software specially designed for website owners. It allows user to quickly and reliably synchronize files/folders between multiple local computers and remote FTP servers, and is able to automatically recognize the file changes and update/delete the corresponding files. As a result, it saves the trouble of manually synchronizing files, and saves the users a lot of time and energy spent on this.

ExpanDrive is a powerful and practical cross-platform cloud drive mapping tool that can mount a variety of cloud disks as network drive that works like a local disk. It supports Amazon S3, Dropbox, Google Drive, Google Team Drives, Amazon Drive, Box, OneDrive, OneDrive for Business, Sharepoint, Openstack Swift and other internationally-known cloud drive services. In addition, for webmasters or administrators, it also supports mounting your own servers as local disks via SFTP (SSH), FTP, WebDAV for easy and efficient use.

When people need to synchronize, backup or frequently share files/data between a variety of devices (including computers and mobile phones), any traditional ways of file transfer are relatively inadequate. For example, a lot of cloud storage services like Dropbox have more and more and increasingly obvious limitations or restrictions. These include: files have to be uploaded to their servers for transfer, very limited disk space capacity, pretty high requirements on Internet connection speed and stability, limitation of transmission speed and bandwidth usage, very few acceptable file types, not high enough security, easy to be blocked by some countries, expensive cost, and so on. Thereupon, Resilio Sync (formerly called BTsync, full name BitTorrent Sync, now Sync for short) came out.