diff --git a/g/GLib/GLib-2.64.0-GCCcore-8.3.0.eb b/g/GLib/GLib-2.64.0-GCCcore-8.3.0.eb
new file mode 100644
index 00000000..2412cdca
--- /dev/null
+++ b/g/GLib/GLib-2.64.0-GCCcore-8.3.0.eb
@@ -0,0 +1,44 @@
+# JH 2020 and LK
+
+easyblock = 'MesonNinja'
+
+name = 'GLib'
+version = '2.64.0'
+
+homepage = 'http://www.gtk.org/'
+description = """GLib is one of the base libraries of the GTK+ project"""
+
+toolchain = {'name': 'GCCcore', 'version': '8.3.0'}
+toolchainopts = {'pic': True}
+
+source_urls = ['http://ftp.gnome.org/pub/gnome/sources/glib/%(version_major_minor)s/']
+sources = ['glib-%(version)s.tar.xz']
+
+builddependencies = [
+    ('Meson', '0.53.0', '-Py-3.7', True),
+    ('Ninja', '1.9.0', '', True),
+    ('binutils', '2.32'),
+    ('pkg-config', '0.29.2'),
+]
+
+dependencies = [
+    ('libffi', '3.3'),
+    ('gettext', '0.20.1'),
+    ('libxml2', '2.9.9'),
+    ('PCRE', '8.43'),
+    ('util-linux', '2.34'),
+]
+
+# avoid using hardcoded path to Python binary in build step
+preconfigopts = "export PYTHON=python && "
+
+configopts = "--buildtype=release --default-library=both "
+
+fix_python_shebang_for = ['bin/*']
+
+sanity_check_paths = {
+    'files': ['lib/libglib-%(version_major)s.0.a', 'lib/libglib-%%(version_major)s.0.%s' % SHLIB_EXT],
+    'dirs': ['bin', 'include'],
+}
+
+moduleclass = 'vis'
diff --git a/g/GSL/GSL-2.6-GCCcore-8.3.0.eb b/g/GSL/GSL-2.6-GCCcore-8.3.0.eb
new file mode 100644
index 00000000..aaac68a4
--- /dev/null
+++ b/g/GSL/GSL-2.6-GCCcore-8.3.0.eb
@@ -0,0 +1,28 @@
+# IT4Innovations 2020
+# LK
+
+easyblock = 'ConfigureMake'
+
+name = 'GSL'
+version = '2.6'
+
+homepage = 'https://www.gnu.org/software/gsl/'
+description = """The GNU Scientific Library (GSL) is a numerical library for C and C++ programmers.
+ The library provides a wide range of mathematical routines such as random number generators, special functions
+ and least-squares fitting."""
+
+toolchain = {'name': 'GCCcore', 'version': '8.3.0'}
+toolchainopts = {'unroll': True, 'pic': True}
+
+source_urls = [GNU_SOURCE]
+sources = [SOURCELOWER_TAR_GZ]
+checksums = ['b782339fc7a38fe17689cb39966c4d821236c28018b6593ddb6fd59ee40786a8']
+
+sanity_check_paths = {
+    'files': ['bin/%s' % x for x in ['gsl-config', 'gsl-histogram', 'gsl-randist']] +
+             ['include/gsl/gsl_types.h'] +
+             ['lib/lib%s.%s' % (x, SHLIB_EXT) for x in ['gsl', 'gslcblas']],
+    'dirs': [],
+}
+
+moduleclass = 'numlib'
diff --git a/g/GST-plugins-base/GST-plugins-base-1.16.2-GCCcore-8.3.0.eb b/g/GST-plugins-base/GST-plugins-base-1.16.2-GCCcore-8.3.0.eb
new file mode 100644
index 00000000..b29eb8fe
--- /dev/null
+++ b/g/GST-plugins-base/GST-plugins-base-1.16.2-GCCcore-8.3.0.eb
@@ -0,0 +1,46 @@
+# IT4Innovations 2020
+# LK
+
+easyblock = 'MesonNinja'
+
+name = 'GST-plugins-base'
+version = '1.16.2'
+
+homepage = 'https://gstreamer.freedesktop.org/'
+description = """GStreamer is a library for constructing graphs of media-handling
+ components. The applications it supports range from simple
+ Ogg/Vorbis playback, audio/video streaming to complex audio
+ (mixing) and video (non-linear editing) processing."""
+
+toolchain = {'name': 'GCCcore', 'version': '8.3.0'}
+
+source_urls = ['https://gstreamer.freedesktop.org/src/gst-plugins-base']
+sources = [SOURCELOWER_TAR_XZ]
+checksums = ['b13e73e2fe74a4166552f9577c3dcb24bed077021b9c7fa600d910ec6987816a']
+
+builddependencies = [
+    ('Meson', '0.53.0', '-Py-3.7', True),
+    ('Ninja', '1.9.0'),
+    ('GObject-Introspection', '1.63.1', '-Py-3.7'),
+    ('gettext', '0.20.1'),
+    ('pkg-config', '0.29.2'),
+    ('Bison', '3.3.2'),
+]
+
+dependencies = [
+    ('zlib', '1.2.11'),
+    ('GLib', '2.64.0'),
+    ('GTK+', '3.24.13'),
+    ('GStreamer', '1.16.2'),
+    ('Gdk-Pixbuf', '2.38.2'),
+    ('X11', '20190717'),
+    ('Mesa', '19.2.1'),
+]
+
+sanity_check_paths = {
+    'files': ['bin/gst-%s-1.0' % x for x in ['discoverer', 'play', 'device-monitor']] +
+             ['lib/libgst%s-1.0.%s' % (x, SHLIB_EXT) for x in ['app', 'audio', 'video']],
+    'dirs': ['include', 'share']
+}
+
+moduleclass = 'vis'
diff --git a/g/GStreamer/GStreamer-1.16.2-GCCcore-8.3.0.eb b/g/GStreamer/GStreamer-1.16.2-GCCcore-8.3.0.eb
new file mode 100644
index 00000000..a9bdb5f7
--- /dev/null
+++ b/g/GStreamer/GStreamer-1.16.2-GCCcore-8.3.0.eb
@@ -0,0 +1,45 @@
+# IT4Innovations 2020
+# LK
+
+easyblock = 'ConfigureMake'
+
+name = 'GStreamer'
+version = '1.16.2'
+
+homepage = 'https://gstreamer.freedesktop.org/'
+description = """GStreamer is a library for constructing graphs of media-handling
+ components. The applications it supports range from simple
+ Ogg/Vorbis playback, audio/video streaming to complex audio
+ (mixing) and video (non-linear editing) processing."""
+
+toolchain = {'name': 'GCCcore', 'version': '8.3.0'}
+
+source_urls = ['https://gstreamer.freedesktop.org/src/gstreamer']
+sources = [SOURCELOWER_TAR_XZ]
+checksums = ['e3f044246783fd685439647373fa13ba14f7ab0b346eadd06437092f8419e94e']
+
+builddependencies = [
+    ('Bison', '3.3.2'),
+    ('flex', '2.6.4'),
+    ('GObject-Introspection', '1.63.1', '-Py-3.7'),
+    ('gettext', '0.20.1'),
+    ('pkg-config', '0.29.2'),
+]
+
+dependencies = [
+    ('zlib', '1.2.11'),
+    ('GMP', '6.1.2'),
+    ('GSL', '2.6'),
+    ('GLib', '2.64.0'),
+    ('GTK+', '3.24.13'),
+    ('libunwind', '1.3.1'),
+]
+
+configopts = '--with-dw=no '
+
+sanity_check_paths = {
+    'files': [],
+    'dirs': ['include', 'share', 'libexec'],
+}
+
+moduleclass = 'vis'
diff --git a/n/Ninja/Ninja-1.9.0-GCCcore-8.3.0.eb b/n/Ninja/Ninja-1.9.0-GCCcore-8.3.0.eb
new file mode 100644
index 00000000..a84448fe
--- /dev/null
+++ b/n/Ninja/Ninja-1.9.0-GCCcore-8.3.0.eb
@@ -0,0 +1,32 @@
+# IT4Innovations 2020
+# LK
+
+easyblock = 'CmdCp'
+
+name = 'Ninja'
+version = '1.9.0'
+
+homepage = 'https://ninja-build.org/'
+description = "Ninja is a small build system with a focus on speed."
+
+toolchain = {'name': 'GCCcore', 'version': '8.3.0'}
+
+source_urls = ['https://github.com/ninja-build/ninja/archive/']
+sources = ['v%(version)s.tar.gz']
+checksums = ['5d7ec75828f8d3fd1a0c2f31b5b0cea780cdfe1031359228c428c1a48bfcd5b9']
+
+builddependencies = [
+    ('binutils', '2.32'),
+    ('Py', '3.7', '', True),
+]
+
+cmds_map = [('.*', "./configure.py --bootstrap")]
+
+files_to_copy = [(['ninja'], 'bin')]
+
+sanity_check_paths = {
+    'files': ['bin/ninja'],
+    'dirs': [],
+}
+
+moduleclass = 'tools'
diff --git a/w/wxWidgets/wxWidgets-3.1.3-Py-3.7.eb b/w/wxWidgets/wxWidgets-3.1.3-Py-3.7.eb
new file mode 100644
index 00000000..51339588
--- /dev/null
+++ b/w/wxWidgets/wxWidgets-3.1.3-Py-3.7.eb
@@ -0,0 +1,71 @@
+# IT4Innovations 2020
+# LK
+
+easyblock = 'ConfigureMake'
+
+name = 'wxWidgets'
+version = '3.1.3'
+
+homepage = 'https://www.wxwidgets.org'
+description = """wxWidgets is a C++ library that lets developers create
+applications for Windows, Mac OS X, Linux and other platforms with a
+single code base. It has popular language bindings for Python, Perl,
+Ruby and many other languages, and unlike other cross-platform toolkits,
+wxWidgets gives applications a truly native look and feel because it
+uses the platform's native API rather than emulating the GUI."""
+
+toolchain = {'name': 'Py', 'version': '3.7'}
+toolchainopts = {'pic': True}
+
+source_urls = ['https://github.com/wxWidgets/wxWidgets/archive']
+sources = ['v%(version)s.tar.gz']
+checksums = ['a5cb5ea326d76b5e472e9400933cef17c900d5c9b549e40eef00b64fe86d7cb0']
+
+builddependencies = [
+    ('gettext', '0.20.1', '', ('GCCcore', '8.3.0')),
+    ('pkg-config', '0.29.2', '', ('GCCcore', '8.3.0')),
+]
+
+dependencies = [
+    ('libpng', '1.6.37', '', ('GCCcore', '8.3.0')),
+    ('zlib', '1.2.11', '', ('GCCcore', '8.3.0')),
+    ('libjpeg-turbo', '2.0.4', '', ('GCCcore', '8.3.0')),
+    ('XZ', '5.2.4', '', ('GCCcore', '8.3.0')),
+    ('jbigkit', '2.1', '', ('GCCcore', '8.3.0')),
+    ('LibTIFF', '4.1.0', '', ('GCCcore', '8.3.0')),
+    ('expat', '2.2.7', '', ('GCCcore', '8.3.0')),
+    ('GTK+', '3.24.13', '', ('GCCcore', '8.3.0')),
+    ('X11', '20190717', '', ('GCCcore', '8.3.0')),
+    ('Mesa', '19.2.1', '', ('GCCcore', '8.3.0')),
+    ('libGLU', '9.0.1', '-Mesa-19.2.1', ('GCCcore', '8.3.0')),
+    ('SDL2', '2.0.10', '', ('GCCcore', '8.3.0')),
+    ('cairo', '1.17.2', '', ('GCCcore', '8.3.0')),
+    ('GST-plugins-base', '1.16.2', '', ('GCCcore', '8.3.0')),
+    ('GLib', '2.64.0', '', ('GCCcore', '8.3.0')),
+]
+
+local_cpath_ext = '$EBROOTGTKPLUS/include/gtk-3.0:$EBROOTGLIB/include/glib-2.0:$EBROOTGLIB/lib/glib-2.0/include'
+
+preconfigopts = 'CPATH=$CPATH:%s ' % local_cpath_ext
+
+configopts = '--enable-intl --enable-ipv6 '
+# Options required by wxPython
+configopts += '--with-gtk=3 --with-gtk-prefix=$EBROOTGTKPLUS '
+# Note: the configure step might claim to find OpenGL headers in 
+# /usr/include, but it will still use the ones from the Mesa dependency above
+configopts += '--with-opengl '
+configopts += '--enable-unicode --enable-sound --enable-graphics_ctx '
+configopts += '--enable-mediactrl --enable-display --enable-geometry '
+configopts += '--enable-debug_flag --enable-optimise --disable-debugreport '
+configopts += '--enable-autoidman --with-sdl '
+configopts += '--disable-webkit --disable-webview --disable-webviewwebkit '
+
+
+prebuildopts = 'CPATH=$CPATH:%s ' % local_cpath_ext
+
+sanity_check_paths = {
+    'files': ['bin/wx-config', 'bin/wxrc'],
+    'dirs': ['include/wx-%(version_major_minor)s/wx', 'lib', 'share'],
+}
+
+moduleclass = 'vis'