RSSme - RSSme is free, lightweight and user-friendly RSS editor.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Feed Launch .NET - Feed Launch .NET is an open-source feed editor for RSS 2.0 and ATOM 1.0 Feeds.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Feeder by Reinvented Software - Feeder is for creating, editing and publishing RSS feeds on macOS.
Wondershare PDFelement - All-in-one PDF editor