A statement from the company said it was also marking 20 years in Australia, where it had more than 290 clients in financial services, utilities, telecommunications and retail.
Additionally, Software AG made its listing on the German Stock Exchange on 29 April 1999, meaning that two decades have elapsed since that occasion as well.
The statement said: "It was 49 years and 364 days ago, on 30 May 1969. Six young men — all employees at the consulting firm AIV (Institut für Angewandte Informationsverarbeitung) — established Software AG in Darmstadt as a start-up.
Software AG chief financial officer Arnd Zinnhardt, chief executive Sanjay Brahmawar, chief revenue officer John Schweitzer, Deutsche Boerse executive board member Hauke Stars and Software AG chief product officer Dr Stefan Sigg.
Chief executive Sanjay Brahmawar, who joined the company in 2018, expressed pride over its heritage: “Fifty years since the birth of Software AG and the birth of an entire industry," he said.
"There is a tremendous history of commitment to customer success in this company – great strengths that we can build on as we move forward. Our fiftieth year has given us the opportunity to reflect on those strengths and harness them for the next century.”
Stuart Rees, vice-president of Software AG ANZ, said: “In Australia, Software AG has grown from strength to strength since we began operations here.
"We are proud of our legacy and in being able to transform to who we are today to provide Australian businesses and organisations with cutting edge technology that can help them achieve better business and technological outcomes.”
Employees of Software AG in a celebratory mood outside the German Stock Exchange on Wednesday.
Of itself, the company said: "People around the world use Software AG products every day – without even being aware of it. For example, eight of the top 10 US banks use Software AG applications for a significant slice of daily global financial transactions – to prevent fraud, manage online transactions, deal with private investments or analyse credit card data.
"Outside finance, if you have ever flown in into the US, driven a car, taken a train, or a bus, gone to outer space or just used an escalator, Software AG most probably eased your rides. If you have ever watched a movie while drinking a Cola, downloaded music, or had coffee on your way to work, you have probably used Software AG.
"If you have sent international post, berthed your ship in Rotterdam, had a package delivered overnight, or effortlessly sent freight through Hong Kong or Singapore, it was supported by Software AG’s precise software engineering."