LOIC 2.9.9.99 - Low Orbit Ion Cannon (Github)
HOIC 2.1 - High Orbit Ion Cannon (Sourceforge)
DoS tools DLed in 2018, about these tools and its comparison is here
Note that DoSing other people servers over other people's network is illegal in most countries and reveal your IP.
Torrent magnet link:
magnet:?xt=urn:btih:52c53701f4542f66639fc2ae7b7ab3f2b3ad7a3c&dn=LOIC%20%26%20HOIC&tr=udp%3a%2f%2ftracker.internetwarriors.net%3a1337%2fannounce&tr=udp%3a%2f%2fp4p.arenabg.ch%3a1337%2fannounce&tr=udp%3a%2f%2ftracker.coppersurfer.tk%3a6969%2fannounce&tr=udp%3a%2f%2feddie4.nl%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.opentrackr.org%3a1337%2fannounce&tr=http%3a%2f%2ftorrentsmd.com%3a8080%2fannounce&tr=udp%3a%2f%2finferno.demonoid.pw%3a3395%2fannounce&tr=udp%3a%2f%2ftracker.leechers-paradise.org%3a6969%2fannounce&tr=http%3a%2f%2fmgtracker.org%3a6969%2fannounce