I remember developing in the early 90s and there was no open source coding tools. It was miserable. One had to write everything from scratch or buy expensive libraries.
I know what you're saying but the discoverability of such tools, especially on DOS, was poor. Everyone I knew was buying compilers or, ahem, downloading them from other than authorized sources. It was unreal when I was able to buy a RedHat CD-ROM for a few bucks (from Tucows?) and get access to a full tool suite. You couldn't get huge software packages over 56K modems from BBSes.
I did not have access to a unix machine, the internet or the GNU toolchain in the early 90s. I was coding on macs and DOS PCs using Borland compilers and Think C on the Mac.