开源笔记软件
笔记里积累的是多年的知识和想法，格式封闭或服务停运都可能让它们难以迁移。开源笔记软件通常使用 Markdown 等开放格式，可以本地存储或自建同步，不会被某一家公司锁定。
如何选择
- 数据格式是否开放（纯 Markdown 文件还是数据库），能否随时导出
- 同步方式：本地文件、WebDAV、自建服务器还是官方云，是否支持端到端加密
- 是否需要双向链接、数据库视图、协同编辑或手机端，按使用场景取舍
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