RSSme - RSSme is free, lightweight and user-friendly RSS editor.
Documents by Readdle - A central hub for all your files.
Feed Launch .NET - Feed Launch .NET is an open-source feed editor for RSS 2.0 and ATOM 1.0 Feeds.
Documents Pro 7 - The ultimate all-in-one mobile office suite for the iPhone and iPad with 8 premium apps in 1.
Feeder by Reinvented Software - Feeder is for creating, editing and publishing RSS feeds on macOS.
GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.