Mac OS X Softwares to Built-in viewer

4shared is a versatile cloud storage and file-sharing platform offering users secure online storage, file synchronization across devices, and the ability to share various file types. It provides a centralized space for managing digital assets and includes features like built-in viewers.

Tonido transforms your computer into a personal cloud server, providing secure remote access to your files, media, and more from any device. Enjoy unlimited storage and bandwidth by leveraging your existing hardware, eliminating the need for third-party cloud services and their limitations.

FBReader is a versatile and free ebook reader application supporting multiple formats including ePub, Kindle azw3, and fb2. It offers a customizable reading experience across different platforms with features like library management, synchronization, and text-to-speech.

Copy.com was a cloud storage and file-sharing service notable for its generous storage offerings, particularly through its referral program. It provided features for file synchronization, backup, and access across multiple devices, aiming to be a competitor in the online backup and storage market. Despite its user-friendly interface and compelling storage incentives, the service was eventually discontinued.

Amazon Kindle offers a comprehensive ecosystem for reading digital books, providing dedicated e-readers and cross-platform apps. It allows users to purchase, download, and read a vast selection of ebooks, newspapers, and magazines, synced across various devices for seamless access.

MediaFire offers robust cloud storage, file synchronization, and file sharing capabilities, providing users with ample space and features for managing digital content online.

Box is a leading cloud content management and file sharing platform designed for businesses of all sizes. It provides secure storage, robust collaboration tools, and seamless integration with popular business applications, empowering teams to work efficiently and securely from anywhere.

Calibre is a powerful and versatile open-source e-book management software that streamlines the organization, conversion, and reading of your digital book collection across various formats and devices.

Foxit Reader is a robust and feature-rich PDF reader and editor that provides users with a comprehensive set of tools for viewing, annotating, signing, and creating PDF documents. Known for its blend of performance and functionality, it caters to both casual users and professionals handling complex PDF workflows.

Google Drive is a powerful cloud storage service that offers secure file storage, synchronization, and collaboration. It integrates seamlessly with Google's suite of applications, providing a comprehensive productivity and file management platform accessible from any device.

4sync is a comprehensive cloud storage and file synchronization service designed to provide users with a secure platform for storing, managing, syncing, and sharing their digital files across multiple devices. It offers robust features for both individual and professional use, including file backup, remote management, and built-in media capabilities.