Universal pencil puzzle editor capable of drawing many different kinds of pencil puzzles. You can also solve problems in the software.

Smart & elegant puzzle compilations
Wow, great new logic puzzle I just discovered!
In this logic puzzle you have to choose nine unique numbers (1 through 9) so that each row and column has a sum of 9 or less.

A really nice logic puzzle for amateurs of maths & voting systems!
Aquarium is a logic puzzle with simple rules and challenging solutions.
The rules of Aquarium are simple:
The puzzle is played on a rectangular grid divided into blocks called "aquariums"
You have to "fill" the aquariums with water up to a certain level or leave it empty.
The water level in each aquarium is one and the same across its full width
The numbers outside the grid show the number of filled cells horizontally and vertically.
Note: there is a "Mass Print" page
They are inspired by whodunit stories, and two popular classic puzzles : the Sudoku, and the text-based logic grids.
There are a number of games you can play with just paper and pen. Not only do these allow for easy travel games, where all you need to pack or find are paper and pen, but paper and pen allow for some interesting abstract games where use of a pen allows for a unique type of game play.
Amazing list of games / resources !
Les mots en escalier : Dans une grille de 7 niveaux, vous devez trouver 6 mots, à chacun des niveaux il y a les mêmes lettres que le niveau supérieur plus une.
The Griddle is a puzzle blog updated Wednesdays (when possible) with a variety of puzzle types.
The puzzles are authored by David Millar and can include classic word searches, sudoku variations, Nikoli-style puzzles, and many others. Check out the most recent puzzles or dig through the archives from the links at the bottom of each page.
AN excellent collection of short pen & paper puzzle games,
mostly abstract / geometrical & mostly for 2 players.
PDF by Ludus Association - 2015
Alda Carvalho - Carlos Pereira dos Santos - João Pedro Neto - Jorge Nuno Silva
This page contains a collection of small computer programs which implement one-player puzzle games. All of them run natively on Unix (GTK), on Windows, and on Mac OS X. They can also be played on the web, as Java or Javascript applets.
It is all distributed under the MIT licence.
Alt: https://github.com/stephenostermiller/qqwing
There are other solvers (e.g. in Python) on GitHub
A solver for a Picross/Nonogram variant, could easily be made into a generator
My improved fork: https://github.com/Lucas-C/wordfind
Alt in JS: http://jswordsearch.sourceforge.net
Alt in Ruby: https://github.com/jamis/wordsearch
Awesome work, the editor + solver is fantastic to build you own puzzle !
My fork with minor improvements: https://github.com/Lucas-C/Nonogram/