ChainForge
ChainForge is an open-source visual programming environment for battle-testing prompts to large language models (LLMs). With ChainForge, you can compare across models, prompts, and prompt parameters using built-in visualizations. Read more on the public GitHub page.
I am developing ChainForge "in the open", as part of a critique of an academic atmosphere of closed-source or it-worked-for-the-user-study prototypes, where broader impacts of new systems are claimed but rarely actually achieved for the benefit of the wider public.