Updated with a new section "LLM observability"

- added 3 companies that offer free logging + monitoring for LLM apps

README.md

@@ -46,6 +46,7 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
   * [IDE and Code Editing](#ide-and-code-editing)
   * [International Mobile Number Verification API and SDK](#international-mobile-number-verification-api-and-sdk)
   * [Issue Tracking and Project Management](#issue-tracking-and-project-management)
+  * [LLM Observability](#llm-observability)
   * [Log Management](#log-management)
   * [Mobile App Distribution and Feedback](#mobile-app-distribution-and-feedback)
   * [Management Systems](#management-system)
@@ -770,6 +771,15 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
 
 **[⬆️ Back to Top](#table-of-contents)**
 
+## LLM Observability
+
+  * [Arize AI](https://arize.com/) — AI Observability and Evaluation Platform for AI engineers. Free up to 1k logs/month. 
+  * [Helicone.ai](https://helicone.ai/) — Open-source LangSmith alternaive for logging, debugging and improving AI apps. Free up to 100k logs/month.
+  * [Langfuse](https://langfuse.com/) — Open-source LLM Engineering Platform. Free up to 50k observations/month.
+
+**[⬆️ Back to Top](#table-of-contents)**
+
+
 ## Log Management
 
   * [bugfender.com](https://bugfender.com/) — Free up to 100k log lines/day with 24 hours retention