I have been using https://apps.kde.org/yakuake/ for years. Having the command line available with a simple key combo while not cluttering up any task manager is great.

THIS, RECRUITS, IS A 20-KILO FERROUS SLUG. FEEL THE WEIGHT. EVERY FIVE SECONDS, THE MAIN GUN OF AN EVEREST-CLASS DREADNOUGHT ACCELERATES ONE TO 1.3 PERCENT OF LIGHT SPEED. IT IMPACTS WITH THE FORCE OF A 38-KILOTOMB BOMB. THAT IS THREE TIMES THE YIELD OF THE CITY BUSTER DROPPED ON HIROSHIMA BACK ON EARTH.THAT MEANS SIR ISAAC NEWTON IS THE DEADLIEST SON-OF-A-BITCH IN SPACE.