Feedcat.net!

FeedBurner is a web feed management provider launched in 2004. FeedBurner provides custom RSS feeds and management tools to bloggers, podcasters, and other web-based content publishers. Feedburner can also replace services like "TwitterFeed" and feed Twitter your URL. More info here: http://www.labnol.org/internet/send-feedburner-feed-to-twitter/11694/

Feedity is a web-based service that enables users to easily create an RSS feed from any website for consumption on any platform.

Feedio is a powerful web-based service for bloggers.

FeedBlitz is the leading independent provider of RSS and blog email marketing, newsletter and subscription services. Easy enough for a blogger to set up in seconds, powerful enough for sophisticated corporate email campaigns, FeedBlitz is smart enough to reach email and social media netowrks with excellent deliverability. Visit feedblitz.com for a free trial.

Create RSS feeds and display RSS feeds on your website with FREE and simple online RSS service. Also Publish podcasting feeds, Track RSS feeds, Import Existing RSS feeds and much much more!