Air Explorer support the next clouds:
As a cloud manager, Air Explorer supports the best cloud storage services. What’s more, you can add any server to Air Explorer using popular protocols such as WebDav, FTP, SFT and S3, giving you even more options for effectively storing and managing your files.

Dropbox
2 GB of free storage
Sign up: Dropbox

Mega
50 GB of free storage
Sign up: mega.nz

Google Drive
15 GB of free storage
Sign up: drive.google.com

Onedrive
5 GB of free storage
Sign up: onedrive.live.com

Onedrive for Business
No free storage
Sign up: onedrive.live.com

Onedrive for China

Box
10 GB of free storage
Sign up: box.com

Yandex
10 GB of free storage
Sign up: disk.yandex.com

Naver
30 GB of free storage
Sign up: cloud.naver.com

FTP

SFTP

WebDav
You can add and use any WebDAV server such as:
-cloudme.com,
-powerfolder.com,
-opendrive.com,
-owndrive.com,...

Mail.ru
25 GB of free storage
Sign up: cloud.mail.ru

Baidu
2 TB of free storage
Sign up: yun.baidu.com

Magenta
10 GB of free storage
Sign up: telekom.de/magentacloud

Hidrive
5 GB of free storage
Sign up: hidrive.com

pCloud
20 GB of free storage
Sign up: pcloud.com

Datto Drive
2 GB of free storage
Sign up: datto.com

Stack Storage
Sign up: transip.be/stack/

Mail.com
2 GB of free storage
Sign up: mail.com

4shared
16 GB of free storage
Sign up: 4shared.com

SharePoint Online
Sign up: office.com/sharepoint

SharePoint China
Sign up: office.com/sharepoint

AWS S3
Sign up: aws.amazon.com/es/s3/

Koofr
10GB of free storage
Sign up: koofr.eu

Backblaze
Sign up: backblaze.com

Infinicloud
10GB of free storage Sign up: infini-cloud.net

Owncloud
Sign up: ownlcoud.com

Nextcloud
Sign up: nextcloud.com

Mediafire
10 GB of free storage
Sign up: mediafire.com

ADrive
Sign up: adrive.com

Jottacloud
5 GB of free storage
Sign up: jottacloud.com

Huawei
5 GB of free storage
Sign up: huawei.com

Orange Flexible Engine
Sign up: orange-business.com

Onlime.dk
5 GB of free storage
Sign up: onlime.dk

Nutstore
Sign up: jianguoyun.com