Hey, I often find people stuck on what to do after they learn a programming language, or stuck in "tutorial hell" where you know the language, but cannot make something yourself. Well, I've got a list of things you can make in mostly any language, for all skill levels :)

If you find these ideas a bit hard or uninteresting, take a look at the bottom of the post where there are some easier ones linked :)

If anyone decides to do any of these, share it in the comments with the source code so others can learn! :)

If anyone has any more ideas, leave them in the comments and I can add them to the list! Have fun :s

Easy

1. Markov chain sentence generator

2. To-do list application (Web or cli)

3. Chatbot

4. Image to ASCII Art

5. Imageboard (Imagine vichan)

6. Create an HSV Color Representation

7. Old school demo effects (Plasma, Tunnel, Scrollers, Zoomers, etc)

8. Fizzbuzz

9. RPN Calculator

10. Count occurences of characters in a given string

11. Towers of Hanoi

12. Calculator the first n digits of pi

13. Given an array of stock values over time, find the period of time where the stocks could have made the most money

14. Highest prime factor calculator

15. Password generator

16. Caesar cipher solver

17. ROT 13

18. Text encryption/decryption (http://rumkin.com/tools/cipher/)

19. Text to hex/binary converter

20. Sierpinski triangle

21. Basic neural network - Simulate individual neurons and their connections

22. Complimentary colour generator

23. Eulerian path

24. Draw spinning 3D cube

25. Cellular textures

26. Snake

27. Rock paper scissors

28. Design a game engine in Unity

29. Yahtzee

30. Oil Panic

31. Connect four

32. Simon

33. Ulam spiral

34. PDF tagger

35. ASCII digital clock

36. Calculate dot and cross product of two vectors

Medium

1. Download manager

2. Elastic producer/consumer task queue

3. IRC client

4. English sentence parser that points to the context of a sentence

5. MIDI player & editor

6. Stock market simulator using yahoo spreadsheet data

7. Graphing calculator

8. TCP/UDP chat server & client

9. Shazam

10. Curses text editor

11. Paint clone

12. Image converter

13. ID3 Reader

14. C++ IDE plugin for sublime/atom/vscode

15. Simple version control - supporting checkout, commit, unlocking, per-file configuration of number of revisions kept

16. Password manager

17. IP/URL Obscurification

18. Radix base converter

19. Encrypted file share

20. Window manager

21. Pixel editor

22. Trivial file transfer protocol

23. Markdown editor

24. Music visualizer

25. Unicode converter

26. Least square fitting algorithm

27. Image steganography

28. Vignere cipher encryption/decryption

29. Game of life

30. Dijkstra's Algorthim

31. Program that displays MBR Contents

32. Random name generator

33. Calculate the first 1,000 digits of pi iteratively

34. Mandlebrot set

35. AI for roguelikes

36. Sudoku/n-puzzle solver using A* algorithm

37. Connect 4 AI

38. Real neural network - Implement a basic feed-forward neural network using matrices for entire layers along with matrix operations for computations

39. Virtual machine with a script that writes "Hello, world"

40. Terminal shell (Executable binaries, pipe system, redirection, history

41. HTML & Javascript debugger

42. Interpreted LISP-like programming language

43. Universal asynchronous receiver/transmitter game

44. Static website generator (Scriptable template, content)

45. Chip 8 emulator

46. Double pendulum simulation

47. Constructive solid geometry

48. Generate a 5-colour scheme from the most dominant tones in an image

49. N-body simulator - with particles having a certain mass and radius depdning on the mass that merge if they collide

50. Knight's tour

51. Tetris

52. Pipe dreams

53. Pac man

54. Shuffling a deck of cards (with visualisation)

55. Simulate a game of tag using a multi-agent system

56. Scorched earch clone

57. Minesweeper

58. An audio/visual 64KB demonstration

59. Sudoku

60. Chess

61. Mastermind

62. Missle command game

63. Tron

64. Breakout

65. Bellman-Ford simulation with at least five vertices

66. Matrix arithmetic

67. File compression Utility (GUI)

68. Bismuth fractal

69. Seam carving

70. Bayesian Filter

71. Rubik's cube solver

Difficult

1. Parametric/Graphic equalizer for .wav files

2. Verlet integration

3. Sound Synthesis

4. Torrent client (CLI or GUI)

5. Text editor

6. OpenAI Gym project

7. Convolutional neural network - Implement a convolutional NN for a handwritten digit recognition test on MNIST dataset

8. Mount filesystems from other OSes using FUSE model

9. Pong game as a UEFI file in colour

10. Esoteric Language

11. C Compiler

12. Turing machine simulator

13. Read, evaluate, print loop using a compiled language

14. Ray tracer

15. Real-time fast fourier transform spectrum visualiser

16. TI-86 emulator

17. Monster raising/breeding simulator

18. Dragon quest / basic RPG engine

19. First person engine in OpenGL

20. Wolfensetin clone

21. Danmaku engine

22. Roguelike engine/dungeon generator

23. Go

24. LISP Interpreter

25. Nonogram generator and solver

26. WMS viewer that isn't web based

Very difficult

1. Relational database system (SQL support, relationships, efficient)

2. Bootloader

3. General Lambert's problem solver

4. Convolutional Neural Network - Implement your own convolutional neural network for handwritten digit recognition, test on MNIST dataset

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