GanttPad
https://gyazo.com/eef35069494126c31ad006022f215fbb
/sushitecture/GanttPadのデザイン哲学
hashrock
https://ganttpad.app/
https://www.youtube.com/watch?v=YdN6IXtaZrM&embeds_referring_euri=https%3A%2F%2Fhashrock.hatenablog.com%2F&source_ve_path=MjM4NTE&feature=emb_title