1. SugarSync：
SugarSync是由J2 Global提供的云服务和文件同步服务。它可以主动同步计算机系统和其他设备中的文件，以进行备份，访问和共享。 Windows，macOS，iOS和Android操作系统均支持它。它由J2 Global在2009年推出。它不提供免费的存储空间。它提供付费的有限和无限存储空间。
2. Ubuntu One：
Ubuntu One是由Canonical Limited提供的文件托管服务，文件同步服务和云服务。这是一个基于OpenID的单点登录服务。它提供了用于在云上存储文件以及从云流式传输音乐的服务。它由Canonical Ltd.开发。适用于Windows，OS X，iOS，Ubuntu和Android。它提供了5 GB的可用存储空间。它于2009年推出。
SugarSync和Ubuntu One之间的区别：
| SUGARSYNC | UBUNTU ONE |
|---|---|
| It is owned by J2 Global. | It was owned by Canonical Limited. |
| It was launched in 2009. | It was also launched in 2009. |
| It does not offer free storage space. | It offered 5 GB free storage space. |
| It was developed by J2 Global. | It was developed by Canonical Ltd. |
| Maximum storage size is 60 GB for personal paid and unlimited for professional paid. | Maximum storage size was unlimited here. |
| It is still in use. | This service was suspended in 2014. |
| Files stored here are encrypted. | Files stored in Ubuntu One were not encrypted. |
| Maximum file size is not limited here. | Maximum file size was 5 GB per file. |
| It is a file hosting, file synchronization and cloud storage service. | It was a commercial file synchronization service. |
| It has traffic or band-width limit of 10 GB per day for free and 250 Gb per day for paid. | It has Amazon S3 limits as traffic or band-width limit. |
| It supports Windows, OS X, Android, OS, Blackberry and Windows Phone. | It supported Windows, OS X, Android, Ubuntu and iOS. |
| It does not have freeware version. | It had freeware version. |