If you're looking for a replacement for Trellis, Converse is a good alternative. It has TLDR and detailed summaries, document chat, library and collection management, and social sharing. The tool can help you read up to 80% faster and comprehend complex documents better, so it's geared for students and professionals.
Another good option is ChatPDF. This AI-based system is geared for understanding PDFs, especially research papers, academic papers and legal contracts. You upload a PDF and ask questions, and it'll provide answers and summaries with source citations. That can be very useful for students, researchers and professionals who need to quickly get answers out of documents.
Otio is another option. It's an AI-native workspace for research and writing, with automated summarization and chat, AI-boosted text editing and support for more than 20 languages. Otio can help you get new ideas out of research, summarize content and organize documents, so it's good for researchers, students and analysts.