1.亚马逊S3：
Amazon S3代表Amazon Simple Storage Service。它是Amazon Web Services提供的一种云存储服务。它通过Web服务界面提供对象存储。它允许存储任何类型的对象，例如用于分析，数据存档，备份和恢复，灾难恢复，混合云存储和Internet应用程序的数据湖。它由AWS在2006年推出。
2. Wuala：
Wuala是文件同步服务，文件存储服务，文件版本控制服务和备份存储服务，最初由Caleido Incorporation提供，但后来由Seagate Technology拥有。它由Dominik Grolimund和Luzius Meisserin开发。它主要是使用Java开发的。它提供了5 GB的免费存储空间。它于2008年推出。
Amazon S3和Wuala之间的区别：
| AMAZON S3 | WUALA |
|---|---|
| It is owned by Amazon. | Originally owned by Caleido Incorporation but was later owned by Seagate Technology. |
| It was launched in 2006. | It was launched in 2008. |
| It does not offer 5 GB free storage space. | It offered 5 GB free storage space but later on it was made only paid-service. |
| It was developed by Amazon Web Services (AWS). | It was developed by Dominik Grolimund and Luzius Meisserin. |
| It does not have referral system for gaining additional free storage space. | Initially it had referral system but later on referral service was suspended. |
| It has the unlimited maximum storage size. | Maximum storage size offered was 2 TB. |
| It supports file versioning. | It also supported file versioning. |
| It does not provide ability to trade local disk storage space. | It provided ability to trade local disk storage space against cloud storage. |
| It requires credit-card details for free trial. | It did not require credit-card details for free services. |
| It is still in use. | This service was suspended in 2015. |