Apps to Selective synchronization

Rclone is a powerful command-line program to manage files on cloud storage. It is a feature-rich alternative to cloud vendors' web storage interfaces and allows for synchronization, migration, and manipulation of data across a multitude of cloud services, offering robust encryption and advanced control.

Qtd Sync is a robust backup and synchronization client and server application designed for reliable data management. It offers comprehensive features like file synchronization, encrypted backups, and support for various storage options including Amazon S3, catering to both personal and business needs.

Freehold is an open, secure, and lightweight platform for managing, syncing, and storing your files and data. It offers robust security features, including end-to-end encryption and encrypted backups, and supports various deployment options including self-hosting.

Librevault is an open-source, zero-knowledge peer-to-peer file synchronization tool emphasizing privacy and security. It allows users to sync files directly between their devices without reliance on a central cloud server, ensuring data remains under user control and is protected by end-to-end encryption.

SyncTrayzor is a seamless and unobtrusive tray utility for Windows that integrates the powerful Syncthing file synchronization service into your system. It provides a familiar Windows application interface for managing your synchronized folders, monitoring activity, and configuring Syncthing, making decentralized file synchronization accessible and user-friendly.

Syncany was a discontinued open-source file synchronization and backup application designed with a strong emphasis on security and privacy. It offered client-side encryption and allowed users to back up and sync data to various cloud storage providers or even their own servers.