One top pick is ChatGPT on Telegram. This integrated bot lets you use AI directly in Telegram for tasks like solving problems, generating ideas, brainstorming and creating content. It can create text, voice and image output, and you can use either the GPT-3.5 or GPT-4 models. It uses a credit system with a free trial and several subscription plans, so it's a good option if you want to boost your productivity and decision-making in your messaging workflow.
Another top pick is Botpress. This chatbot builder is fast and easy to use, and it uses OpenAI's Large Language Models and Generative Pre-trained Transformers. Botpress has a lot of integrations with services like Telegram, WhatsApp and Make.com, and you can use professional greetings, import knowledge and synchronize databases. Botpress also has an API and SDK for customizations, so you can use it to create AI agents that work the way you want.
You might also want to check out Lunabot, which brings ChatGPT to Telegram without requiring an API key or ChatGPT account. It includes pre-built and custom commands for translation, summarization and writing, and works with multiple browsers and mobile apps. Lunabot has flexible pricing options, including a free tier and several paid tiers, so it should work for your budget and needs.
Last, Decision Mentor is geared for structured decision-making using a multi-criteria approach. The app uses AI to help you evaluate and compare options, which can be useful for big decisions. With decision visualization and AI mentor chat-based suggestions, Decision Mentor is a more formalized way to make complex decisions. It's for private decision-making and follows privacy standards, so your data is protected.