Our great sponsors
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LibreOffice
Read-only LibreOffice core repo - no pull request (use gerrit instead https://gerrit.libreoffice.org/) - don't download zip, use https://dev-www.libreoffice.org/bundles/ instead (by LibreOffice)
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
There are plenty of free locally-run options if you look for them. Other commenters have already mentioned PDFSaM. LibreOffice can open and edit PDFs. On Android, I use PSF Utils and AndrOpen Office. You shouldn't have to send documents anywhere outside the devices you use.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.