diff --git a/.gitignore b/.gitignore
index fd1a9ee17..b3f441bf3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .sw[a-z]
 .sv[a-z]
 .*.sv[a-z]
+*.dSYM
 .DS_Store
 /archive/1984/
 /archive/1985/
diff --git a/1998/schweikh2/.gitignore b/1998/schweikh2/.gitignore
index 85e3bc2d7..01b476714 100644
--- a/1998/schweikh2/.gitignore
+++ b/1998/schweikh2/.gitignore
@@ -1 +1,2 @@
 schweikh2
+schweikh2.alt
diff --git a/2011/akari/.gitignore b/2011/akari/.gitignore
index aeee32020..7f7c336a5 100644
--- a/2011/akari/.gitignore
+++ b/2011/akari/.gitignore
@@ -5,3 +5,5 @@ akari3
 akari3.c
 akari4
 akari4.c
+even_output.ppm
+odd_output.ppm
diff --git a/2011/fredriksson/.gitignore b/2011/fredriksson/.gitignore
index f2e512e6b..2324cdb1f 100644
--- a/2011/fredriksson/.gitignore
+++ b/2011/fredriksson/.gitignore
@@ -1 +1,3 @@
 fredriksson
+ag
+ag.c
diff --git a/2011/zucker/.gitignore b/2011/zucker/.gitignore
index 4be68913b..3c482aec0 100644
--- a/2011/zucker/.gitignore
+++ b/2011/zucker/.gitignore
@@ -1 +1,4 @@
+image.ppm
+hello.ppm
+image2.ppm
 zucker
diff --git a/2012/blakely/.gitignore b/2012/blakely/.gitignore
index 5c36c9097..e9ebfc303 100644
--- a/2012/blakely/.gitignore
+++ b/2012/blakely/.gitignore
@@ -1 +1,6 @@
 blakely
+output.gif
+paraboloid.gif
+empty.gif
+flat.gif
+
diff --git a/2012/deckmyn/.gitignore b/2012/deckmyn/.gitignore
index cba32ef42..45ebaf614 100644
--- a/2012/deckmyn/.gitignore
+++ b/2012/deckmyn/.gitignore
@@ -1 +1,6 @@
 deckmyn
+example_greensleeves
+greensleeves.pbm
+sheetmusic.pbm
+sheetmusic.pbm
+sheetmusic.pbm
diff --git a/2012/grothe/.gitignore b/2012/grothe/.gitignore
index 11e3173dd..0fc8c9617 100644
--- a/2012/grothe/.gitignore
+++ b/2012/grothe/.gitignore
@@ -1 +1,8 @@
 grothe
+grothe.c.1
+grothe.c.2
+cookie_recipe_restore.txt
+cookie_piece1.dat
+cookie_piece2.dat
+cookie_piece3.dat
+cookie_piece4.dat
diff --git a/2012/grothe/cookie_piece1.dat b/2012/grothe/cookie_piece1.dat
deleted file mode 100644
index 5c415075b..000000000
Binary files a/2012/grothe/cookie_piece1.dat and /dev/null differ
diff --git a/2012/grothe/cookie_piece2.dat b/2012/grothe/cookie_piece2.dat
deleted file mode 100644
index e6de76b18..000000000
Binary files a/2012/grothe/cookie_piece2.dat and /dev/null differ
diff --git a/2012/grothe/cookie_piece3.dat b/2012/grothe/cookie_piece3.dat
deleted file mode 100644
index 6778a1cde..000000000
Binary files a/2012/grothe/cookie_piece3.dat and /dev/null differ
diff --git a/2012/grothe/cookie_piece4.dat b/2012/grothe/cookie_piece4.dat
deleted file mode 100644
index 815dc96f2..000000000
Binary files a/2012/grothe/cookie_piece4.dat and /dev/null differ
diff --git a/2012/hamano/.gitignore b/2012/hamano/.gitignore
index cd0177a16..4bc0c7d1b 100644
--- a/2012/hamano/.gitignore
+++ b/2012/hamano/.gitignore
@@ -1 +1,7 @@
 hamano
+hint
+hint.pdf
+hello.pdf
+hello2
+hello3
+output.pdf
diff --git a/2012/hou/.gitignore b/2012/hou/.gitignore
index 02f7029f9..186d1661b 100644
--- a/2012/hou/.gitignore
+++ b/2012/hou/.gitignore
@@ -1 +1,3 @@
 hou
+hou.html
+remarks.htm
diff --git a/2012/omoikane/.gitignore b/2012/omoikane/.gitignore
index e82960a40..38289f738 100644
--- a/2012/omoikane/.gitignore
+++ b/2012/omoikane/.gitignore
@@ -1,5 +1,8 @@
+data
 data.c
+key
 key.c
 nyaruko
+output
 output.c
 regenerated.bin