Apps Related to Support for OPML import of feeds

Icedove is a robust and adaptable open-source email client forked from Mozilla Thunderbird, offering comprehensive email management, RSS feed aggregation, integrated chat, and extensive customization options through extensions.

QuiteRSS is a free, open-source, cross-platform RSS/Atom news feed reader featuring an integrated web browser, filtering options, notifications, and support for multiple languages. It's designed for efficient news consumption and organization.

Thunderbird is a free, open-source email client developed by the Mozilla Foundation, offering robust features for managing multiple email accounts, integrated chat, and RSS feeds. Known for its extensibility and focus on user privacy and security.