Formal:
* Конец (konets) - This is the most common and literal translation.
* Заключение (zaklyuchenie) - This is more formal and often used in writing, like the ending of a book or speech.
Informal:
* Финал (final) - This is often used for the end of a movie, play, or other performance.
* Всё (vsyo) - This literally means "everything" but can also be used to mean "that's it" or "the end".
* Вот и всё (vot i vsyo) - This means "that's it" and is a more conversational way to say "the end".
In writing:
* К. (K.) - This is an abbreviation for "конец" and is used in written texts, like the end of a chapter in a book.
The best way to choose the right translation depends on the specific situation and the level of formality you want to use.