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• 유용한 무료 사이트 모음 * 무료사이트 39개 기획 http://trello.com TrelloInfinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.trello.comhttps://www.notion.so Notion – The all-in-one workspace for your notes, tasks, wikis, and databases.A new tool that blends your everyday work apps into one. It's the all-in-one workspace for you an.. Windows/Tip 2020. 8. 27.