There's one at the top of this page for a start...
Just key in Freeware into google and you will find out about dozens.
However, TweakXP.com and similar are very handy for hundreds of tips to speed up your system.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.