Letsupload is described as 'You can upload any type of files' and is an website in the Backup & Sync category. There are more than 100 alternatives to Letsupload, not only websites but also apps for a variety of platforms, including Windows, Mac, iPhone and Android. The best alternative is Nextcloud, which is both free and Open Source. Other great sites and apps similar to Letsupload are Dropbox (Freemium), Google Drive (Freemium), Syncthing (Free, Open Source) and MEGA (Freemium).
Live Documents is a web-enabled Office productivity suite (word processing, spreadsheets, presentations, mail) that can be used as software on your desktop or as services within your browser whether you are online or offline.
Pvtbox Sync allows direct, fast, and secure peer-2-peer data transfer between all of your devices including PC, Mac, Servers, NAS, and Mobile (Android & iOS). Sync/Share/Collaborate all your files with ease.
Qabel is a free, published-source cryptography platform. The platform encrypts everything that is connected with it end-to-end, including Messenger, e-mail, industrial applications and individual solutions.