The best alternatives to Thymeline are Trello, Columns, and Zoho Sprints. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Trello is a web-based Kanban-style list-making application. Originally made by Fog Creek Software in 2011, it was spun out to form the basis of a separate company in 2014 and later sold to Atlassian in January 2017.
Columns gives you an overview of your project, so you can clearly see the big picture. Checklists help you organize things and focus on what's important.
Zoho Sprints is an online project management tool that helps teams manage and track agile projects, know where each sprint stands in the scrum board, get insights from agile reports, and collaborate on the go.