AIPRM offers a large library of more than 70,000 private prompts, along with a system to manage and reuse them. It's got prompt management, custom tones and writing styles, and even live crawling for generating new content. That makes it a good choice for maintaining a consistent voice for your brand and it can be used on a variety of budgets with different pricing levels.
Knit is another good option, with a collection of pro prompt editors and project management with permission levels. It supports multiple models and has features like version control, security controls and code export so you can incorporate prompts into your apps. Knit also offers a free starter plan, so it's good for a variety of needs and budgets.
If you want a more collaborative approach, you might like PromptDrive. The service lets teams create, share and refine prompts with features like organization tools, prompt variables and a Chrome extension for quick access. It offers different pricing levels, including a free plan for personal use, so it's a good option for team collaboration.