diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ba93ff4..333b1a21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 ## Version History
 
+## Unreleased
+
+* python-build: Add PyPy 5.6.0 (#751)
+* python-build: Add Stackless 2.7.12 (#753)
+* python-build: Add Stackless 2.7.11
+* python-build: Add Stackless 2.7.10
+
 ## 1.0.3
 
 * python-build: Add CPython 3.6.0b3 (#731, #744)
diff --git a/plugins/python-build/share/python-build/ironpython-2.7.7-rc2 b/plugins/python-build/share/python-build/ironpython-2.7.7-rc2
new file mode 100644
index 00000000..6320e80a
--- /dev/null
+++ b/plugins/python-build/share/python-build/ironpython-2.7.7-rc2
@@ -0,0 +1,2 @@
+install_package "IronPython-2.7.7rc2" "https://github.com/IronLanguages/main/releases/download/ipy-2.7.7-rc2/IronPython-2.7.7rc2-unix.tar.bz2#338b855d007a2f8f12498fe67039483e671c98f6ea8320add4cdedd53b118113" ironpython
+# FIXME: have not confirmed to install setuptools into IronPython yet
diff --git a/plugins/python-build/share/python-build/stackless-2.7.10 b/plugins/python-build/share/python-build/stackless-2.7.10
new file mode 100644
index 00000000..3c491171
--- /dev/null
+++ b/plugins/python-build/share/python-build/stackless-2.7.10
@@ -0,0 +1,4 @@
+#require_gcc
+install_package "openssl-1.0.2g" "https://www.openssl.org/source/openssl-1.0.2g.tar.gz#b784b1b3907ce39abf4098702dade6365522a253ad1552e267a9a0e89594aa33" mac_openssl --if has_broken_mac_openssl
+install_package "readline-6.3" "https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
+install_package "stackless-dev-stackless-b6b4c928e880" "https://bitbucket.org/stackless-dev/stackless/get/v2.7.10-slp.tar.bz2#70ac8fd4f9c6a735757520fd3faa35180324d72108752d956c40f0571c732f22" ldflags_dirs standard verify_py27 ensurepip
diff --git a/plugins/python-build/share/python-build/stackless-2.7.11 b/plugins/python-build/share/python-build/stackless-2.7.11
new file mode 100644
index 00000000..a67b873c
--- /dev/null
+++ b/plugins/python-build/share/python-build/stackless-2.7.11
@@ -0,0 +1,4 @@
+#require_gcc
+install_package "openssl-1.0.2g" "https://www.openssl.org/source/openssl-1.0.2g.tar.gz#b784b1b3907ce39abf4098702dade6365522a253ad1552e267a9a0e89594aa33" mac_openssl --if has_broken_mac_openssl
+install_package "readline-6.3" "https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
+install_package "stackless-dev-stackless-456e93659e69" "https://bitbucket.org/stackless-dev/stackless/get/v2.7.11-slp.tar.bz2#74093ac2824b167ecf8592164291c610dd9b31c8dce8b40b485ba9f39721e5b8" ldflags_dirs standard verify_py27 ensurepip
diff --git a/plugins/python-build/share/python-build/stackless-2.7.12 b/plugins/python-build/share/python-build/stackless-2.7.12
new file mode 100644
index 00000000..7091020b
--- /dev/null
+++ b/plugins/python-build/share/python-build/stackless-2.7.12
@@ -0,0 +1,4 @@
+#require_gcc
+install_package "openssl-1.0.2g" "https://www.openssl.org/source/openssl-1.0.2g.tar.gz#b784b1b3907ce39abf4098702dade6365522a253ad1552e267a9a0e89594aa33" mac_openssl --if has_broken_mac_openssl
+install_package "readline-6.3" "https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
+install_package "stackless-dev-stackless-82aaa252fbdc" "https://bitbucket.org/stackless-dev/stackless/get/v2.7.12-slp.tar.bz2#af57d08477e8b9545d30b36df0ea903bdc96073898af6b4730f713bb74fd277d" ldflags_dirs standard verify_py27 ensurepip