diff --git a/f/FLAC/FLAC-1.3.1.eb b/f/FLAC/FLAC-1.3.1.eb
new file mode 100644
index 00000000..b84a11dd
--- /dev/null
+++ b/f/FLAC/FLAC-1.3.1.eb
@@ -0,0 +1,30 @@
+##
+# This file is an EasyBuild reciPY as per https://github.com/easybuilders/easybuild
+#
+# Author:    Stephane Thiell <sthiell@stanford.edu>
+###
+
+easyblock = 'ConfigureMake'
+
+name = 'FLAC'
+version = '1.3.1'
+
+homepage = 'https://xiph.org/flac/'
+description = """Programs and libraries for working with Free Lossless Audio Codec (FLAC) files."""
+
+toolchain = {'name': 'dummy', 'version': ''}
+
+sources = [SOURCELOWER_TAR_XZ]
+source_urls = ['http://downloads.xiph.org/releases/flac/']
+
+# use of assembly routines requires a recent binutils
+#builddependencies = [('binutils', '2.25', '', ('GCC', '4.9.2'))]
+
+runtest = 'check'
+
+sanity_check_paths = {
+    'files': ['bin/flac', 'include/FLAC/all.h', 'lib/libFLAC.%s' % SHLIB_EXT],
+    'dirs': [],
+}
+
+moduleclass = 'data'
diff --git a/m/matplotlib/matplotlib-2.1.1-Python-2.7.15.eb b/m/matplotlib/matplotlib-2.1.1-Python-2.7.15.eb
new file mode 100644
index 00000000..e9707db2
--- /dev/null
+++ b/m/matplotlib/matplotlib-2.1.1-Python-2.7.15.eb
@@ -0,0 +1,26 @@
+# IT4Innovations 2019
+
+easyblock = "PythonPackage"
+name = 'matplotlib'
+version = '2.1.1'
+
+homepage = 'http://matplotlib.org'
+description = """Matplotlib is a python 2D plotting library which produces publication quality figures in a variety of
+ hardcopy formats and interactive environments across platforms. matplotlib can be used in python scripts, the python
+ and ipython shell, web application servers, and six graphical user interface toolkits."""
+
+toolchain = {'name': 'GCCcore', 'version': '8.2.0'}
+
+source_urls = ['https://github.com/matplotlib/matplotlib/archive/']
+sources = ['v%(version)s.tar.gz']
+
+dependencies = [
+    ('freetype', '2.9.1', '-libpng-1.6.34', True),
+    ('libpng', '1.6.34', '', True),
+    ('Python', '2.7.15'),
+]
+
+sanity_check_paths = {'files': [], 'dirs': [
+    'lib/python3.6/site-packages/%(name)s-%(version)s-py3.6-linux-x86_64.egg/%(name)s'], }
+
+moduleclass = 'python'
diff --git a/s/SoX/SoX-14.4.2.eb b/s/SoX/SoX-14.4.2.eb
new file mode 100644
index 00000000..08fae942
--- /dev/null
+++ b/s/SoX/SoX-14.4.2.eb
@@ -0,0 +1,27 @@
+# IT4Innovations 2019
+
+easyblock = 'ConfigureMake'
+
+name = 'SoX'
+version = '14.4.2'
+
+homepage = 'http://http://sox.sourceforge.net/'
+description = """Sound eXchange, the Swiss Army knife of audio manipulation"""
+
+toolchain = {'name': 'dummy', 'version': ''}
+
+sources = [SOURCELOWER_TAR_GZ]
+source_urls = ['https://sourceforge.net/projects/sox/files/sox/%(version)s']
+
+# These are not strictly mandatory but add flac and mp3 support to SoX
+dependencies = [
+    ('FLAC', '1.3.1'),
+    ('LAME', '3.100')
+]
+
+sanity_check_paths = {
+    'files': ['bin/sox', 'include/sox.h', 'lib/libsox.%s' % SHLIB_EXT],
+    'dirs': [],
+}
+
+moduleclass = 'data'
diff --git a/t/Tcl/Tcl-8.6.9-GCCcore-8.2.0.eb b/t/Tcl/Tcl-8.6.9-GCCcore-8.2.0.eb
new file mode 100644
index 00000000..1a1fc59d
--- /dev/null
+++ b/t/Tcl/Tcl-8.6.9-GCCcore-8.2.0.eb
@@ -0,0 +1,27 @@
+# IT4Innovations 2019
+easyblock = 'ConfigureMake'
+
+name = 'Tcl'
+version = '8.6.9'
+
+homepage = 'http://www.tcl.tk/'
+description = """Tcl (Tool Command Language) is a very powerful but easy to learn dynamic programming language,
+suitable for a very wide range of uses, including web and desktop applications, networking, administration,
+testing and many more."""
+
+toolchain = {'name': 'GCCcore', 'version': '8.2.0'}
+
+source_urls = ["http://prdownloads.sourceforge.net/tcl"]
+sources = ['%(namelower)s%(version)s-src.tar.gz']
+
+dependencies = [
+    ('zlib', '1.2.11', '', True),
+]
+
+configopts = '--enable-threads EXTRA_INSTALL="install-private-headers"'
+
+runtest = 'test'
+
+start_dir = 'unix'
+
+moduleclass = 'lang'
diff --git a/t/Tk/Tk-8.6.9-GCCcore-8.2.0.eb b/t/Tk/Tk-8.6.9-GCCcore-8.2.0.eb
new file mode 100644
index 00000000..de7f229c
--- /dev/null
+++ b/t/Tk/Tk-8.6.9-GCCcore-8.2.0.eb
@@ -0,0 +1,28 @@
+# IT4Innovations 2019
+
+easyblock = 'ConfigureMake'
+
+name = 'Tk'
+version = '8.6.9'
+
+homepage = 'http://www.tcl.tk/'
+description = """Tk is an open source, cross-platform widget toolchain that provides a library of basic elements for building
+ a graphical user interface (GUI) in many different programming languages."""
+
+toolchain = {'name': 'GCCcore', 'version': '8.2.0'}
+
+source_urls = ["http://prdownloads.sourceforge.net/tcl"]
+sources = ['%(namelower)s%(version)s-src.tar.gz']
+
+patches = ['Tk-8.6.4_different-prefix-with-tcl.patch']
+
+dependencies = [
+    ('Tcl', version),
+    ('zlib', '1.2.11', '', True),
+]
+
+configopts = '--enable-threads --with-tcl=$EBROOTTCL/lib --without-x CFLAGS="-I$EBROOTTCL/include"'
+
+start_dir = 'unix'
+
+moduleclass = 'vis'