Add Bifrost to Generative AI section

Added Bifrost as an open-source AI gateway with enterprise-grade reliability.

README.md

@@ -976,6 +976,7 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
   * [Langtrace](https://langtrace.ai) - enables developers to trace, evaluate, manage prompts and datasets, and debug issues related to an LLM application’s performance. It creates open telemetry standard traces for any LLM which helps with observability and works with any observability client. Free plan offers 50K traces/month.
   * [LangWatch](https://langwatch.ai) - A LLMOps platform helping AI teams measure, monitor, and optimize LLM applications for reliability, cost-efficiency, and performance. With a powerful DSPy component, we enable seamless collaboration between engineers and non-technical teams to fine-tune and productionize GenAI products. Free plan includes all platform features, 1k traces/month and 1 workflow DSPy optimizers. [#opensource](https://github.com/langwatch/langwatch)
   * [Lumenfall.ai](https://lumenfall.ai/) - AI media gateway providing unified access to leading image generation models via an OpenAI-compatible API. The platform itself is free to use with zero markup and no subscription fee. Inference costs for most models are billed at provider price, but FLUX.1 [schnell] FP8 is offered free forever with unlimited usage for registered users. Built-in failover and provider resilience included.
+  * [Maxim](https://www.getmaxim.ai) - An LLM evaluation and observability platform with agent simulation and prompt playground. Free tier offers 10k monthly logs, access to prompt playground, simulations and evaluations via BYOK.
   * [Mediaworkbench.ai](https://mediaworkbench.ai) - MediaWorkbench.ai offers 100,000 free words for Azure OpenAI, DeepSeek, and Google Gemini models, enabling users to access powerful tools for code generation, deep research, and image creation.
   * [OpenRouter](https://openrouter.ai/models?q=free) - Provides various free AI models including DeepSeek R1, V3, Llama, and Moonshot AI. These models excel in natural language processing and are suitable for diverse development needs. Note that while these models are free to use, they are subject to rate limits. Additionally, OpenRouter offers paid models for more advanced requirements, for instance Claude, OpenAI, Grok, Gemini, and Nova.
   * [Othor AI](https://othor.ai/) - An AI-native fast, simple, and secure alternative to popular business intelligence solutions like Tableau, Power BI, and Looker. Othor utilizes large language models (LLMs) to deliver custom business intelligence solutions in minutes. The Free Forever plan provides one workspace with five datasource connections for one user, with no limits on analytics. [#opensource](https://github.com/othorai/othor.ai)