1. Ubuntu 一：
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。它提供了在云上存储文件以及从云中传输音乐的服务。它由 Canonical Ltd 开发，适用于 Windows、OS X、iOS、Ubuntu 和 Android。它提供了 5 GB 的免费存储空间。它于2009年推出。
2.快速分享：
RapidShare 是由 RapidShare AG 提供的文件托管服务、云存储服务和在线备份服务。它有能力同时处理大量用户。它有多种语言版本，如英语、法语、德语和西班牙语。它是由Christian Schmid开发的。它最初被命名为ezShare。它是最早的云存储服务之一。它于2002年推出。
Ubuntu One 和 RapidShare 的区别：
| UBUNTU ONE | RAPIDSHARE |
|---|---|
| It was owned by Canonical Limited. | It was owned by RapidShare AG. |
| It was launched in 2009. | It was launched in 2002. |
| It was developed by Canonical Ltd. | It was developed by Christian Schmid. |
| It offered 5 GB free storage space. | It offered limited free storage space. |
| It offered unlimited maximum storage space for paid. | It offered limited maximum storage space for paid. |
| It was a file hosting, commercial file synchronization and cloud storage service. | It was a file hosting and online backup service. |
| Files could be downloaded multiple times. | Files could be downloaded only 10 times in free account. |
| Links did not expire after inactivity of some days. | While here, links expired after inactivity of 60 days. |
| It was suspended in 2014. | This service was suspended in 2015. |
| Maximum file size was 5 GB per file. | Maximum file size was 500 MB per file. |