I copy from a comment of mine from last week. In case you wanna procrastinate on a fascinating story about how Apple transitioned to NextStep's stack without completely annihilating their already weak developer base, here's a few links:

You get a corporate drama, a human drama and a tech drama all wrapped up in one series of presentations:

Jobs' return (as a consultant) 1997, promoting technologies from NeXT. Watch basically everyone asleep at the wheel except Jobs, the man with a plan.

https://www.youtube.com/watch?v=4QrX047-v-s

WWDC Q&A - 'the art of saying no'

https://www.youtube.com/watch?v=6iACK-LNnzM

Jobs' hostile takeover in July by doing a (probably illegal?) stock dump

https://en.wikipedia.org/wiki/Gil_Amelio#Apple_Computer

Announcing a Deal with Microsoft as de facto CEO in August, booed by the crowd

https://www.youtube.com/watch?v=IOs6hnTI4lw

Internal meeting in September 1997

https://www.youtube.com/watch?v=9GMQhOm-Dqo

iMac introduction 1998 - Apple is back

https://www.youtube.com/watch?v=oxwmF0OJ0vg

Macworld 1998 - Apple is essentially saved as a company

https://www.youtube.com/watch?v=gdYiqVzPjAc

OSX Strategy reveal

https://www.youtube.com/watch?v=E5dWDg6f9eo

1999 - OSX Server launch

https://youtu.be/NuCYHrSig94?t=48m40s

2000 - OSX launch

https://www.youtube.com/watch?v=Ko4V3G4NqII