corporatecollaborationnetwork
Worth saying this site reads better than most paid newsletters I have tried, and a stop at corporatecollaborationnetwork confirmed that comparison, the bar for free content is often lower than for paid but this site clears the paid bar consistently and that says something about the editorial approach behind the work being published here regularly.
wildthistlemarket
Once I had read three posts the editorial pattern was clear, and a look at wildthistlemarket confirmed the pattern from a fourth angle, sites where the underlying approach reveals itself through accumulated reading rather than being announced are sites with real depth and this one has that quality clearly visible across multiple pieces consistently.
clicktoexploremarketideas
Picked this up between two other things I was doing and got drawn in completely, and after clicktoexploremarketideas my original tasks were completely forgotten for a while, content that derails a workflow in a positive way by being more interesting than what you were already doing is rare and worth recognising clearly.