Rumkin has a pretty neat collection of cipher tools for both encrypting and decrypting
Vigenere Cipher Codebreaker can solve vigenere ciphers with or without the key. (You will need sufficiently long ciphertext to break the cipher without a key.)
Len Schulwitz is useful for encoding/decoding those pesky base 58 numbers
QuipQiup can attempt to ...
If the suggestion is to alter the option bar for the list of questions,
I would very much like to see unsolved added
and would use it regularly,
but perhaps unanswered could be retained as well.
All too truly, unanswered is useless for challenge puzzles,
which constitute the vast majority of questions here.
Nonetheless, unanswered still has ...
Litscape has an extensive list of words finding tools (for example pattern matching, words containing or made from certain letters, single word anagrams, etc)
Ceptimus Word Ladder solver, finds a word ladder from word A to word B
Wordsmith's Advanced Anagramming is a multilingual, multi-word anagram solver with a range of options to restrict ...
The On-Line Encyclopedia of Integer Sequences is useful for puzzles involving integer sequences
Base Converter converts between binary, decimal, hexadecimal and ASCII
Calculator Soup is a cornucopia of tools (index) for manipulating numbers in myriad contexts, even sports
Prime Factors Calculator calculates the prime factors of integers less ...
RGB Color Wheel correlates colors to RGB (#RRGGBB and 255-255-255) and HSV ( °-%-%)
GIF-Explode is a web-tool to show individual frames of animated gif images. Just provide the link to the image.
GeoGebra Tools are an online collection of tools for drawing geometries and mathematical content online.
TinkerCAD is a browser-based 3D ...
Thank you for wanting to make the effort for not posting duplicates! Sometimes, it's really hard to know upfront, because you're posing the puzzle in a different context (random example: using a story about monkeys, while it was posted as a pirate story). By hanging around here for a long time, some people just 'remember' that they've seen the puzzle before ...
Chess board editor is an online interactive chessboard with PGN viewer and editor
Sudoku Solver is a fully featured sudoku solver by Andrew Stuart
Qhex Puzzle Tools contains a wide array of puzzling tools, including solving various logic puzzles (Masyu, Sudoku, Lights Out, Thermometers, Kakuro, Fill-a-Pix, Minesweeper, Hitori, Nurikabe, Tapa, ...
Measure Distance on a Map measures the distance and travel time between two places, with many options such as snapping to road or not, mode of transport (including different levels of car speeds) and units to measure in.
London Underground map is a map that shows all the tube stations in London, England.
Altitude map lets you find the ...
Useful Information Sources
Telephone Dialing Codes for countries, and also shows their flags
Internet Movie DataBase for film and TV references
Runes - for all things runey
Wolfram|Alpha - computational knowledge engine
I don't think you can.
The search facility isn't perfect. I've written a pretty thorough tutorial for it on another site's meta, but I don't think it extends as far as discovering a character inside a "word". It can find punctuation inside a word, if you know the whole word, but not just that symbol. So basically, you can't search just for / to find ...
River crossing simulator
Take your typical river crossing problem
Yellow won't go with Black
Red will only go alone
Pink will only go if Yellow is going
Blue won't go with Green, and will only go if Yellow is going
Green will go without any conditions
Black won't go alone and won't go with any of Yellow and Blue.
With the tool you can see the puzzle ...
Arithmetic operations puzzle solver
Solves formation-of-numbers puzzles of the form:
3  3  8  8 = 24
where the brackets are replaced by arithmetic operations.
How to use
Call the function:
target is the final number.
numbers is the list of constituent numbers, not necessarily in order. The code doesn't care about the ...
All angles word search
With this program, you can put use any letter grid of any shape.
Here is how it goes:
As shown in the demonstration, you can type in anything into the text box as long as it's in the alphabet or a space.
Then the program will highlight all the series of cells in the grid that makes up the word. You can also edit the grid by clicking ...
Queens on a chess board
The below pygame program allows the user to place any number of queens on a chess board, and visualize what arrangement of queens will threaten which squares of the chess board.
Here is how it goes (source of arrangements used in the gif here):
wn = pygame.display.set_mode((600, 600))
Words to numbers equation solver
With this program, you can type in equations in the form of
cat + d0g = pets
bird - seed = hunger
you * me = happ9 = h3 * she
The program will find all possible values for all the letters used that will satisfy the equation. If a = 3, b = 6, c = 0, then abc = 360. Each letter can only have one number assigned to it,...
Water jugs puzzle simulator
You have a jug generator that gives you as many jugs as you need. Simply drag the jug that's in the top-left corner of the screen, and a new one appears in its place. Drag any jug anywhere. If you want the jugs to align like they're sitting on a level table, right-click on them.
At first, they can each hold 0 units of water. To ...
Scale simulation real-time
The concept is simple enough.
You have a scale that adds up the total weights on each side, and tilts accordingly.
On the top corner is a weight. If you drag the weight, a new one appears in its place, giving you infinite weights.
You can choose the weight for each weight, and always change it again when needed.
Here is a ...
With this little app, you can see your text being encoded with rot-13 (any other number) as you type.
Here is how it will run:
Here is the entire code:
wn = pygame.display.set_mode((600, 600))
font = pygame.font.Font(None, 32)
def __init__(self, x, y, w, h, title='Text Box', ...