10 languages C, rk, ><>, Rail, Width, Gol><>, Fission, Cardinal, brainfuck, Befunge-98, 993991 bytes
//Q rk:start print: "C^nrk" rk:end @,k*97C'a"rk"a"><>"a-1"Sail"a"Width"a"Gol><>"a"Fission"a"Cardinal"a"brainfuck"a"Befunge-98"
main(){printfputs("C");}
/*
$'main'
\-[C\n\rk\n\><>\n\Rail]o
++++[++++>---<]>.>++++++++++.[------->+++<]>.-------.>++++++++++.[->++++++<]>++.--.++.>++++++++++.>-[--->+<]>---.[------>+<]>--.++++++++.+++.>++++++++++.[------>+<]>.+++[->++++<]>+.-----.--[--->+<]>--.------------.>++++++++++.[->+++++++<]>+.[--->+<]>++.---.--[->+++<]>.--.++.>++++++++++.[->+++++++<]>.[-->+++<]>.++++++++++..----------.++++++.-.>++++++++++.+[->++++++<]>+.-[-->+++<]>--.--[--->+<]>---.--------------.+++++.+++++.-------------.+++++++++++.>++++++++++.+[--->++++<]>--.[--->+<]>----.+++[->+++<]>++.++++++++.+++++.--------.-[--->+<]>--.+[->+++<]>+.++++++++.
R"C"N"rk"N"><>"N'S_!"ail"N"Width"N"Gol><>"N"Fission"*
/"><>krC"oaoooaooooE ao'liaR>'~ooooaoS"Width"aoS"Gol><>"; QQaAWAmcOAWAaicmaiWAAiwAOaOwWAAAOawmmFOcQww
%"C"++++++++++,"rk","><>",=--t++,"ail"~,"Width","Gol><>","Fission","Cardinal"
*/
568 bytes of this is just the brainfuck code. The Befunge-98 program produces:
C
rk
><>
Rail
Width
Gol><>
Fission
Cardinal
brainfuck
Befunge-98