diff --git a/README.md b/README.md
index bfd54c8..467334c 100644
--- a/README.md
+++ b/README.md
@@ -60,15 +60,6 @@ The following hardware and software components are mainly used in the lab.
   * 24MHz 8-channel [logic analyzer](https://www.ebay.com/sch/i.html?LH_CAds=&_ex_kw=&_fpos=&_fspt=1&_mPrRngCbx=1&_nkw=24mhz%20logic%20analyzer&_sacat=&_sadis=&_sop=12&_udhi=&_udlo=): [software](https://www.saleae.com/)
   * Oscilloscope Keysight Technologies [DSOX3034T](https://www.keysight.com/en/pdx-x202175-pn-DSOX3034T/oscilloscope-350-mhz-4-analog-channels?&cc=CZ&lc=eng) (350 MHz, 4 analog channels), including 16 logic timing channels [DSOXT3MSO](https://www.keysight.com/en/pdx-x205238-pn-DSOXT3MSO/3000t-x-series-oscilloscope-mso-upgrade?cc=CZ&lc=eng) and serial protocol triggering and decode options [D3000BDLA](https://www.keysight.com/en/pd-2990560-pn-D3000BDLA/ultimate-software-bundle-for-the-3000a-t-x-series?&cc=CZ&lc=eng)
 
-* Development tools:
-  * [Vivado](https://www.xilinx.com/products/design-tools/vivado.html) Design Suite 2020.2: [installation](https://github.com/tomas-fryza/vhdl-course/wiki/List-of-versions)
-
-  * [EDA Playground](https://www.edaplayground.com/playgrounds?searchString=Brno&_showAllResults=on&language=VHDL) is a cloud-based service that runs in your browser
-
-  * [TerosHDL](https://terostechnology.github.io/terosHDLdoc/) is an open-source IDE for FPGA: [installation](https://github.com/tomas-fryza/vhdl-course/wiki/How-to-install-TerosHDL-on-Windows-and-Linux) :+1:
-
-  * [ghdl + GtkWave](https://github.com/tomas-fryza/vhdl-course/wiki/How-to-install-ghdl-on-Windows-and-Linux)
-
 ## References
 
 1. [Digital electronics wiki](https://github.com/tomas-fryza/vhdl-course/wiki)