Contently

 Contently  is a content marketing platform geared towards large publishers with a variety of web tools for content creation, marketing, and analytics as well as portfolio tools and a marketplace for freelance writers.

Their website indicates "freelancers matched with brands can pitch ideas, submit work, and instantly receive payment all in one place."

Examples

 * Freelance science writer and journalist Michael Marshall uses Contently (https://michaelmarshall.contently.com/) to aggregate his various articles across outlets to one location. His portfolio page allows editors and readers to filter his work by clients, topics, skills, and formats (Article / blog post, Infographic, Podcast, Whitepaper, etc.)

Freelance Advice
The company also operates The Freelancer as a service geared toward the freelance space as a supplement to their paid service.

Criticism

 * Their portfolio pages don't have RSS or feeds indicating they're made solely for marketing purposes rather than consumption.