RSS mixers

Yahoo! Pipes - an advanced RSS mixer with a graphical user interface; supports simple operators, filters, and many advanced functions
Feedbite - a combination of an online RSS reader and an RSS mixer, with the possibility to vote for RSS “bundles”
Feedblendr - a very simple RSS mixer that doesn’t require registration
Blogsieve - full featured RSS mixer that lets you blend up to 5 feeds and do some advanced filtering on the results
Feedcombine - RSS mixer that lets you blend feeds from a list of predefined sources
Feedshake - RSS mixing and some basic filtering
xFruits - a set of very neat tools for RSS blending, filtering and conversion, including an RSS to PDF tool
BlastFeed - an RSS mixer that lets you combine and filter feeds and get them delivered via e-mail, IM or RSS
FeedRinse - an advanced RSS filter that enables you to get rid of the “spam” in your RSS feeds
FeedDigest - RSS mixer that lets you mix and sort feeds and then republish them on a website
Popfly - Microsoft’s very promising RSS mixer, currently in closed beta
Google Mashup Editor (GME) - Google’s set of developer tools for creating mashups
RSSMesh - a PHP script that lets you blend several feeds into one
Afeeda - RSS mixer which lets you blend all your favorite feeds into one

Azure Logic Apps - Azure Logic Apps and Power Automate. Azure Logic Apps is a cloud platform where you can create and run automated workflows with little to no code. By using the visual designer and selecting from prebuilt operations, you can quickly build a workflow that integrates and manages your apps, data, services, and systems. 

Azure Logic Apps simplifies the way that you connect legacy, modern, and cutting-edge systems across cloud, on premises, and hybrid environments and provides low-code-no-code tools for you to develop highly scalable integration solutions for your enterprise and business-to-business (B2B) scenarios.