At its core, ISE 10.1 provides a complete front-to-back design flow:

Why would anyone still use ISE 10.1 in 2024/2025?

The Spartan-3 series (especially the XC3S500E on the popular Nexys 2 board or the XC3S1000 on the Spartan-3E Starter Kit) is an excellent resource for learning FPGA fundamentals. These boards cost a fraction of modern Zynq boards. ISE 10.1 is lightweight compared to Vivado (20+ GB installation). It runs comfortably on an old laptop, making it perfect for introductory university labs where the goal is to teach state machines and counters, not AI accelerators.

AROS - a solid foundation

AROS is a complete NG OS based on AmigaOS 3.1 API. This means it includes many known components like datatypes (24bit), network stack, AHI, MUI-Implementation (Zune), USB-support, Themeing, window out of screen and RTG. The default desktop (Wanderer) is functional similar to old 3.1 workbench.

Additions

Addition there are Scalos and Magellan desktops. Both are highly configurable what I made extensive use of. Also Aros Vision is extended with additional commodities in WBStartup, handler and devices, libraries, commands in C and lots of software including many applictations, guis, games, demos.

Useable on both WinUAE and Apollo V4