RSSme - RSSme is free, lightweight and user-friendly RSS editor.
Buffalo Go Framework - A Go web development eco-system, designed to make your life easier.
Feed Launch .NET - Feed Launch .NET is an open-source feed editor for RSS 2.0 and ATOM 1.0 Feeds.
MarsEdit - MarsEdit is a desktop blog editing application for the Mac. It provides an offline interface to most popular blogging systems. WordPress, Blogger, Tumblr, Movable Type, and many other systems are supported.
Feeder by Reinvented Software - Feeder is for creating, editing and publishing RSS feeds on macOS.
Scribble - An on demand blog-writing subscription for $499/mo 📝