My brother and I co-founded an internet services company in Tamworth, where we provided internet services via a leased 64K ISDN line from BT, connecting to Netkonect at the London Internet Exchange (LINX). Although expensive, this connection was considered fast at the time.
One of our initial tasks was to build and configure web, FTP, Usenet, and mail servers, each running on Linux-based PCs. This project required me to familiarise myself with early versions of many GNU and open-source packages, including Sendmail, WU-FTP, and Apache.
WU-FTP is open source and at the time it did not feature individual account quotas, so I modified the C source code to maintain a file system quota for each user.