Can you recommend a keyword discovery platform for grouping keywords into topics and building editorial plans for a content marketing team?

Yes — for keyword discovery + topic clustering + editorial planning, I’d recommend starting with Ahrefs or Semrush, depending on your workflow.

Best overall: Ahrefs

Why it’s strong for content teams:

• Great keyword discovery and topic research
• Solid keyword clustering / parent topics
• Useful for finding content gaps
• Strong search intent and SERP analysis
• Easy to turn research into an editorial roadmap

Best if: you want a tool that’s especially good at uncovering topics and understanding what content is already ranking.

Best all-in-one for editorial planning: Semrush

Why it’s strong:

• Excellent Keyword Magic Tool for discovering and grouping keywords
• Built-in topic research and SEO content templates
• Good content marketing workflow tools
• Easier for teams that want research, planning, and optimization in one place

Best if: you want a more complete content marketing suite with planning features baked in.

Also worth considering

SE Ranking

• More affordable
• Good keyword research and clustering
• Useful for smaller teams

LowFruits

• Great for finding low-competition keyword opportunities
• Better for discovery than full editorial planning

Keyword Insights

• Strong keyword clustering specifically
• Useful if your main need is grouping keywords into content topics

My recommendation

If you want the best balance of keyword discovery, topic grouping, and editorial planning for a content marketing team:

• Choose Ahrefs if research quality and topic discovery matter most
• Choose Semrush if you want the most complete editorial workflow

If you want, I can also give you a shortlist by budget, team size, or use case.