Secure office and productivity apps
格努内里克
Gnumeric is an open-source spreadsheet program.
卡利格拉
Calligra Suite is an office and graphic art suite by KDE. It is available for desktop PCs, tablet computers, and smartphones. It contains applications for word processing, spreadsheets, presentation, vector graphics, and editing databases.
自由辦公室
LibreOffice is a powerful and free office suite, used by millions of people around the world.