Productivity
Start with the work you want to finish. These analyses distinguish quick capture, task planning and collaborative workspaces so a new tool does not become another task.
Todoist: to-do list & planner
Todoist provides a structured place to capture and organize tasks.
Slack
Slack combines channels, meetings, documents, and connected services.
Notion: Notes, Tasks, AI
Connected documents and project information can help a team, provided somebody owns the structure.
Google Keep - Notes and Lists
Quick capture and shared lists suit small pieces of information; a growing archive needs deliberate habits.
Dropbox: Cloud & Photo Storage
Dropbox brings cloud files, sharing, and mobile capture together.
Google Drive
Google Drive combines cloud storage, sharing, scanning, and access across devices.
Evernote - Note Organizer
Evernote combines notes, document capture, tasks, and calendar connections.
Trello: Manage Team Projects
Trello brings capture, cards, and visual planning together.
Obsidian
A local Markdown knowledge base offers a clear file model, with organization and synchronization decisions left to you.
How to choose in this category
Describe the problem before choosing the software. Forgotten errands call for dependable capture; scattered project decisions call for a shared place to keep context. A flexible workspace can handle many kinds of information, but its structure must still be maintained by someone.
Try one real project before importing an entire archive. Check that you can capture an item, find it again and identify who should act next. Then inspect export and account options for the information you need to retain. The most useful system is the one whose daily maintenance is proportionate to the work it supports.