Gokapi
Gokapi is a lightweight server for sharing files that expire after a set number of downloads or a set number of days. It is for administrators who want to control uploads while still making files available for others to download. An administrator can set the download limit or the time limit, so a shared file does not remain available beyond that chosen threshold. This makes the expiration rule part of each file-sharing process, whether access should end after downloads or days. Gokapi is similar to the discontinued Firefox Send and can fill the same basic role of sharing files with automatic expiration. The main limitation is its stricter upload model: only the administrator is allowed to upload files. People who receive shared files cannot use the server to upload their own files, so it does not provide open, user-driven uploading like Firefox Send did.