That's a good point newbie.... Surely it would be nice to get more specificity rather than blanket statements.
For your eyes only(The buttcoiner must overt their eyes as because these facts may harm their narrative)-
First four are in the article ...
1) Poon, Dryja, Elizabeth Stark , and Olaoluwa Osuntokun - Dryjas Lightning Network
2) Rusty Russell - Blockstream's LN implementation
3) AmikaPay LN implementation
4) StrawPay LN implementation
This is the fifth one -
5)
http://thunder.network being developed by Mats Jerratsch at Blockchain